Targets.cpp: [cygwin] Add the predefined macro "_X86_", according to newer version of cygwin/w32api.

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This fixes the missing warning here:

struct S {
    template <typename T>
    void meth() {
        char arr[3];
        arr[4] = 0; // warning: array index 4 is past the end of the array
    }
};

template <typename T>
void func() {
    char arr[3];
    arr[4] = 0; // no warning
}

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Sema::ActOnStartOfFunctionDef is already doing.

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"entry:" is not met in -Asserts build.

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I wasn't sure where to put the test case for this, but this seemed like as good
a place as any. I had to reorder the tests here to make them legible while
still matching the order of metadata output in the IR file (for some reason
making it virtual changed the ordering).

Relevant commit to fix up LLVM to actually respect 'artificial' member
variables is coming once I write up a test case for it.

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don't crash when loading a PCH with the older format.

The introduction of the control block broke compatibility with PCHs from
older versions. This patch allows loading (and rejecting) PCHs from an older
version and allows newer PCHs to be rejected from older clang versions as well.

rdar://12821386

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Patch by Martin Nowack.

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Thanks for the -Wdocumentation catch, Dmitri!

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Thanks to Saleem Abdulrasool, aka compnerd!

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specifies not to. Dont build ASTMatchers with Rewriter disabled and
StaticAnalyzer when it's disabled.

Without all those three, the clang binary shrinks (x86_64) from ~36MB
to ~32MB (unstripped).


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Patch by Anastasi Voitova with with small fixes by me.


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Patch contributed by Philip Craig!


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Remove little endian specification from SPIR data layout - SPIR doesn't define endiannes in the data layout.

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bit-patterns which are not valid values for enumerated or boolean types.
These checks are the ubsan analogue of !range metadata.


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Patch by Andrew Turner.

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We now check a few methods for UIResponder, NSResponder, and NSDocument.

Patch by Julian Mayer!

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and make sure additional uses don't get introduced.  <rdar://problem/12858424>.



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Sorry for the large commit, but it is much faster to convert in batches.

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This is a Band-Aid fix to a false positive, where we complain about not
initializing self to [super init], where self is not coming from the
init method, but is coming from the caller to init.

The proper solution would be to associate the self and it's state with
the enclosing init.

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to (SEL). Fixes // rdar://12859590


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This still isn't quite right, but it fixes a crash.

I factored out findCommonParent because we need it on the result of 
getImmediateExpansionRange: for a function macro, the beginning
and end of an expansion range can come out of different
macros/macro arguments, which means the resulting range is a complete
mess to handle consistently.

I also made some changes to how findCommonParent works; it works somewhat
better in some cases, and somewhat worse in others, but I think overall
it's a better balance.  I'm coming to the conclusion that mapDiagnosticRanges
isn't using the right algorithm, though: chasing the caret is fundamentally
more complicated than any algorithm which only considers one FileID for the
caret can handle because each SourceLocation doesn't really have a single parent.
We need to follow the same path of choosing expansion locations and spelling
locations which the caret used to come up with the correct range
in the general case.

Fixes <rdar://problem/12847524>.



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Converts:
    LanguageExtensions
    LibASTMatchers
    LibTooling
    PCHInternals
    ThreadSanitizer
    Tooling

Patch by Mykhailo Pustovit!
(with minor edits by Dmitri Gribenko and Sean Silva)

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I don't think this will be visible just yet on <clang.llvm.org/docs/>
since I don't think that the necessary server-side setup has taken
place.

Don't shoot me over the theme. I don't want to duplicate LLVM's theme
into the clang repo at the moment, so I just used one of Sphinx's
default themes.

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the diagnostic has a valid location.

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has inconsistent ownership with the backing ivar, point the error location to the
ivar.

Pointing to the ivar (instead of the @synthesize) is better since this is where a fix is needed.
Also provide the location of @synthesize via a note.

This also fixes the problem where an auto-synthesized property would emit an error without
any location.

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My variadics patch, r169588, changed these calls to typically be
bitcasts rather than calls to a supposedly variadic function.
This totally subverted a hack where we intentionally dropped
excess arguments from such calls in order to appease the inliner
and a "warning" from the optimizer.  This patch extends the hack
to also work with bitcasts, as well as teaching it to rewrite
invokes.

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rdar://12851905

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