[PATCH] CodeGen for CapturedStmt

[Ben Langmuir]

Hi rjmccall, ABataev,

CodeGen for CapturedStmts
    
- EmitCapturedStmt creates a captured struct containing all of the captured
  variables, and then emits a call to the outlined function.  This is similar
  in principle to EmitBlockLiteral.

- GenerateCapturedFunction actually produces the outlined function.  It is based
  on GenerateBlockFunction, but is much simpler.  The function type is currently
  fixed, and the function contains only the body of the captured statement.

- When this is extended for different kinds of captured statements, I imagine
  that hooks will be added to customize the function type/parameters, and insert
  prologue/epilogue code.

This patch depends on the following uncommitted patches:
- http://llvm-reviews.chandlerc.com/D369 (parsing)
- http://llvm-reviews.chandlerc.com/D370 (AST)
- http://llvm-reviews.chandlerc.com/D433 (Sema)

http://llvm-reviews.chandlerc.com/D640

Files:
  include/clang/AST/GlobalDecl.h
  lib/AST/ItaniumMangle.cpp
  lib/AST/MicrosoftMangle.cpp
  lib/CodeGen/CGDecl.cpp
  lib/CodeGen/CGExpr.cpp
  lib/CodeGen/CGStmt.cpp
  lib/CodeGen/CodeGenFunction.cpp
  lib/CodeGen/CodeGenFunction.h
  test/CodeGen/captured-statements.c
  test/CodeGenCXX/captured-statements.cpp
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