[PATCH] Pragma for captured statements

[Andy Zhang]

This patch implements parsing for "#pragma clang __debug captured" as a first step for implementing captured statements (see http://lists.cs.uiuc.edu/pipermail/cfe-dev/2013-January/027540.html).

Added preprocessor support for the new pragma to PragmaDebugHandler. The parser returns a StmtEmpty for this pragma until the AST changes go in.

http://llvm-reviews.chandlerc.com/D369

Files:
  include/clang/Basic/TokenKinds.def
  include/clang/Lex/PPCallbacks.h
  include/clang/Parse/Parser.h
  lib/Frontend/PrintPreprocessedOutput.cpp
  lib/Lex/Pragma.cpp
  lib/Parse/ParsePragma.cpp
  lib/Parse/ParseStmt.cpp
  test/Parser/captured-statements.c
  test/Preprocessor/pragma-captured.c
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