[PATCH] Small CapturedStmt improvements

[Ben Langmuir]

Hi wei.pan, doug.gregor,

Add a CapturedStmt.h similar to Lambda.h to reduce the typing required to get to the CapturedRegionKind enum.  This also allows codegen to access this enum without including Sema/ScopeInfo.h.

Also removes some duplicated code for capturing 'this' between CapturedStmt and Lambda.

http://llvm-reviews.chandlerc.com/D712

Files:
  include/clang/AST/Stmt.h
  include/clang/Basic/CapturedStmt.h
  include/clang/Sema/ScopeInfo.h
  include/clang/Sema/Sema.h
  lib/Parse/ParsePragma.cpp
  lib/Sema/Sema.cpp
  lib/Sema/SemaExprCXX.cpp
  lib/Sema/SemaStmt.cpp
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