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1. We were hitting the NextIsPrevious assertion because we were trying
to merge decl chains that were independent of each other because we had
no Sema object to allow them to find existing decls. This is fixed by
delaying loading the "preloaded" decls until Sema is available.

2. We were trying to get identifier info from an annotation token, which
asserts.  The fix is to special-case the module annotations in the
preprocessed output printer.

Fixed in a single commit because when you hit 1 you almost invariably
hit 2 as well.

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This is causing a failure in the msan buildbot that I am having trouble
reproducing.  Reverting until I can figure out what went wrong.

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In particular, #pragma clang __debug, and #include implicitly changed
into @import were causing assertion failures.

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I threw in a couple of test cases for UD-suffixes -- already working, but
it wasn't immediately obvious to me.

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if they were already concatenated in source using the spelling locations
even if they came from a macro expansion.

This fixes an issue where a GUID passed as macro argument ends up
malformed after preprocessing because we added spaces inside it.

rdar://13016645

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The member variable is always "LangOpts" and the member function is always "getLangOpts".

Reviewed by Chris Lattner

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grammar requires a string-literal and not a user-defined-string-literal. The
two constructs are still represented by the same TokenKind, in order to prevent
a combinatorial explosion of different kinds of token. A flag on Token tracks
whether a ud-suffix is present, in order to prevent clients from needing to look
at the token's spelling.


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Remove unreachable code in Clang. (replace with llvm_unreachable where appropriate or when GCC requires it)

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It already works (and is useful with) macro locs as well.

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when avoiding paste.  Patch by David Peixotto!


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form a >>=.  Patch by Abramo Bagnara, testcase by me.


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C++-specific tokens.



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behavior is more likely to be confusing than useful.



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require a space (to avoid concatenation) if the numeric constant had a
leading period.
 - PR3819.


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PrintPreprocessedOutput into its own file.  No functionality change.


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