Point out that --coverage and -ftest-coverage, which is what most people
are used to, do not enable clang's frontend based coverage pass.

Suggested by Benn Bolay!

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about member specializations to avoid ambiguous and confusing terminology.


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cl-link.c test was failing after r294604 because of the change in the order of
parameters.

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__fastfail terminates the process immediately with a special system
call. It does not run any process shutdown code or exception recovery
logic.

Fixes PR31854

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We need -wholearchive for asan_cxx, the same than for asan.
Clang Driver will add asan_cxx at the beginning of the arg list that we pass to
the linker. To ensure that all the static libraries are linked to asan_cxx, we
force the linker to include the object files in asan_cxx.

This fixes some linker errors when compiling with address sanitizer for MT and
passing the static library libFuzzer.

Differential Revision: https://reviews.llvm.org/D29754

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1. Adds the command line flag for clzero.
2. Includes the clzero flag under znver1.
3. Defines the macro for clzero.
4. Adds a new file which has the intrinsic definition for clzero instruction.

Patch by Ganesh Gopalasubramanian with some additional tests from me.

Differential revision: https://reviews.llvm.org/D29386

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Summary: Documentation update for https://reviews.llvm.org/D29662

Differential Revision: https://reviews.llvm.org/D29722

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nested-name-specifier (as the standard appears to require), treat it as the
type specifier 'decltype(auto)' followed by a nested-name-specifier starting
with '::'.


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Differential Revision: https://reviews.llvm.org/D29725


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Sometimes the MS ABI needs to emit thunks for declarations that don't
have bodies. Destructor thunks make calls to inlinable functions, so
they need line info or LLVM will complain.

Fixes PR31893

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Summary:
OriginalPrefix is only needed for line comment sections. Moved from the base class to the child class.
No functional changes.

Reviewers: djasper

Reviewed By: djasper

Subscribers: cfe-commits, klimek

Differential Revision: https://reviews.llvm.org/D29716

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Summary: With a growing suite of comment-related tests, it makes sense to take them out of the main test file. No functional changes.

Reviewers: djasper

Reviewed By: djasper

Subscribers: cfe-commits, klimek, mgorny

Differential Revision: https://reviews.llvm.org/D29713

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Summary:
Make the comment alignment respect sections of line comments originally alinged
with the next token. Until now the decision how to break a continuous sequence
of line comments into sections was taken without reference to the next token.

source:
```
class A {
public: // comment about public
  // comment about a
  int a;
}
```

format before:
```
class A {
public: // comment about public
        // comment about a
  int a;
}
```

format after:
```
class A {
public: // comment about public
  // comment about a
  int a;
}
```

Reviewers: djasper, klimek

Reviewed By: klimek

Subscribers: cfe-commits, klimek

Differential Revision: https://reviews.llvm.org/D29626

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[X86] Add -mprefetchwt1/-mno-prefetchwt1 command line options and __PREFETCHWT1__ define to match gcc.

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[X86] Update command line documentation for -mclwb and -mmovbe which I forgot in my previous commits.

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In the future, we should also add a clwb intrinsic to the backend, a frontend builtin, and an instrinsic header file.

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This feature flag indicates that the processor has support for removing certain instructions from user mode software. But the feature flag by itself doesn't indicate if the support is enabled in the OS. The affected instructions aren't even instructions the compiler would emit. So I don't think think this feature flag should be in the compiler.

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[X86] Remove PCOMMIT feature support since Intel has deprecated this instruction with no plans to release products with it.

Intel's documentation for the deprecation https://software.intel.com/en-us/blogs/2016/09/12/deprecate-pcommit-instruction

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Summary:
This teaches clang how to parse and lower the 'interrupt' and 'naked'
attributes.

This allows interrupt signal handlers to be written.

Reviewers: aaron.ballman

Subscribers: malcolm.parsons, cfe-commits

Differential Revision: https://reviews.llvm.org/D28451

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Add a warning for shadowed variables across records.  Referencing a
shadow'ed variable may not give the desired variable.  Add an optional
warning for the shadowing.

Patch by James Sun!

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an attribute-specifier-seq. (Also fixes the same problem for deduction-guides.)


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Point to the PCM file that could not be found.

rdar://problem/30381981

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Following up on r291465 after a regression in r276159. When we use
-fmodule-name=X while building a PCH, modular headers in X will be
textually included and the compiler knows that we are not building
module X, so don't serialize such headers in the PCH as being part of a
module, because at this point they are not.

This was causing subtle bugs and malformed AST crashes, for instance,
when using the PCH in subsequent compiler invocation with -fmodules, the
HFI for a modular header would map to the PCH, which would force a
module load of and unexistent module ID.

rdar://problem/30171164

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Before:
  LooooooooooooooooongType
  variable(nullptr, [](A *a) {});

After:
  LooooooooooooooooongType
      variable(nullptr, [](A *a) {});

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This reverts commit SVN r294148.  Seems that it was mistaken, and GCC
does still define `__unix` and `unix` when in GNU mode.

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