[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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NFC.

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Also accept -G= (and -msmall-data-threshold=) as an alias for -G on MIPS as well as Hexagon.


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Improve workaround for Sphinx's lack of support for command line options containing '+', '.' etc. to be more stable as the set of options changes.


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and generate documentation for all (non-hidden) options supported by the
'clang' driver.


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[sanitizer-coverage] emit __sanitizer_cov_trace_pc_guard w/o a preceding 'if' by default. Update the docs, also add deprecation notes around other parts of sanitizer coverage

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[docs] Regenerate DiagnosticsReference.rst. We don't have automatic generation of this set up server-side yet.


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Summary:
Docs for clang::Decl and clang::TemplateSpecializationType have
not been generated since LLVM_ALIGNAS was added to them.

Tell Doxygen to expand LLVM_ALIGNAS to nothing as described at
https://www.stack.nl/~dimitri/doxygen/manual/preprocessing.html

Reviewers: aaron.ballman, klimek, alexfh

Subscribers: ioeric, cfe-commits

Differential Revision: https://reviews.llvm.org/D28850

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Summary: Add missing flag to UsersManual
It would be good to merge it to 4.0 branch.

Reviewers: hans

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D28727

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This time, make ignored options, such as /utf-8, show up as well if they
have help text.

Also, since we're now exposing -fdelayed-template-parsing, add help text
to the -fno version so that shows up as well.

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Updated index and UsersManual with OpenCL description.

Review: https://reviews.llvm.org/D28080 



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Bots seem happy with `diagnose_if` so far, so I'm optimistically adding
release notes for it.


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There was a small error in the code in the tutorial. The tutorial contains a few errors which results in code not being able to compile.

One error was described here: https://llvm.org/bugs/show_bug.cgi?id=25583 .

I found and fixed the error and one additional error.

Reviewers: aaron.ballman, malcolm.parsons

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D28180

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Accidental commit. LLVM changes have not been pushed yet
This reverts commit 59245341.

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Summary:
I needed to know whether a FieldDecl had an in-class
initializer for D26453. I used a narrowing matcher there, but a
traversal matcher might be generally useful.

Reviewers: sbenza, bkramer, klimek, aaron.ballman

Subscribers: aaron.ballman, Prazek, cfe-commits

Differential Revision: https://reviews.llvm.org/D28034

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After Darwin has been updated not to link in stdc++ on Darwin this actually
started to break.

Differential Revision: https://reviews.llvm.org/D27598

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https://reviews.llvm.org/D27769


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This was accidentally removed in r260506, even though we only support
non-allocatable global register variables. The general (allocatable) case
is explicitly not supported.

Differential Revision: https://reviews.llvm.org/D27473


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Summary: Needed for https://reviews.llvm.org/D27166

Reviewers: sbenza, bkramer, klimek

Subscribers: aemerson, cfe-commits

Differential Revision: https://reviews.llvm.org/D27447

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