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The existing code also failed to allocate a buffer for it so getcwd corrupted
the stack. sys::fs::current_path takes care of the memory management.

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make the gdb tests and the Windows bots happy.

The Path::GetCurrentDirectory API is not equivalent to ::getcwd(), so 
r180652 causes a gdb tests to fail.  On the other hand, <sys/param.h> 
isn't defined on Windows systems, so that causes Windows builds to fail.
rdar://12237559

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We switch the order of offset and field type to make TBAAStructType node
(name, parent node, offset) similar to scalar TBAA node (name, parent node).


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bots recover.
rdar://12237559

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and limit comment extraction to public c++
bases. // rdar://13647476


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structs are compatible, check whether the fields
of the structs have the same name.  This prevents
erroneous coalescing of (in particular) anonymous
structs.


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[libclang] Introduce clang_Module_getASTFile function that returns the module file where a module object came from.

rdar://13743084

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In an Objective-C for-in loop "for (id element in collection) {}", the loop
will run 0 times if the collection is nil. This is because the for-in loop
is implemented using a protocol method that returns 0 when there are no
elements to iterate, and messages to nil will result in a 0 return value.

At some point we may want to actually model this message send, but for now
we may as well get the nil case correct, and avoid the false positives that
would come with this case.

<rdar://problem/13744632>

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Casts to bool (and _Bool) are equivalent to checks against zero,
not truncations to 1 bit or 8 bits.

This improved reasoning does cause a change in the behavior of the alpha
BoolAssignment checker. Previously, this checker complained about statements
like "bool x = y" if 'y' was known not to be 0 or 1. Now it does not, since
that conversion is well-defined. It's hard to say what the "best" behavior
here is: this conversion is safe, but might be better written as an explicit
comparison against zero.

More usefully, besides improving our model of booleans, this fixes spurious
warnings when returning the address of a local variable cast to bool.

<rdar://problem/13296133>

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[PCH/modules] Require the preprocessing record option to match the used PCH, if modules are enabled.

The preprocessing record becomes important when modules are enabled, since it is used to calculate the
module cache hash.

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[Modules] Fix an issue where the reconstructed redeclaration chain was incomplete, missing the definition from a module.

-Make sure that a deserialized external decl gets added to the TU scope.
-When associating an identifier with a set of decls, use the most recent local ones,
  if they exist, otherwise associating decls from modules (that came after a local one)
  will lead to an incomplete reconstructed re-declaration chain.

rdar://13712705

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a comment, grab the first comment found in its class
heirarchy. Also, when a category is mossing a comment,
grab comment of its primary class. // rdar://13647476


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gcc.  No test case included as I'm having problems finding a test case where
the inode/dev don't match.

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In -fparse-all-comments mode empty '//' comments were recognized as
RCK_Invalid, and were not merged with next and previous lines.

Patch by Amin Shali.


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On a 32 bit build this moves LinkageSpecDecl from 52 to 48 bytes.

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Original commit message:

Fix a case in linkage computation that should check for single line extern "C".

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Thanks to Bill Wendling for the original testcase.

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patch -n r180198.
When reporting on missing property accessor implementation in
categories, do not report when they are declared in primary class,
class's protocol, or one of it super classes or in of the other
categories. // rdar://13713098


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When we find a friend declaration we have to skip transparent contexts for doing
lookups, but we should not skip them when inserting the new decl if the lookup
found nothing.

Fixes PR15841.

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When computing the other parameters, ‘op’ is checked for being null before it’s dereferenced.

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Deeply nested expressions basically break clang-format's memoization.
This patch slightly improves the situations and makes expressions like

  aaaaa(aaaaa(aaaaa(aaaaa(aaaaa(aaaaa(aaaaa(aaaaa(
      aaaaa(aaaaa(aaaaa(aaaaa(aaaaa(aaaaa(aaaaa(aaaaa(aaaaa(aaaaa(aaaaa(
          aaaaa(aaaaa(aaaaa(aaaaa(aaaaa(aaaaa(aaaaa(aaaaa(aaaaa(aaaaa(
              aaaaa(aaaaa(aaaaa(aaaaa(aaaaa(aaaaa(aaaaa(aaaaa(aaaaa(
                  aaaaa(aaaaa())))))))))))))))))))))))))))))))))))))));

work.

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