[PATCH] Implement CapturedStmt AST

[Wei Pan]

================
Comment at: include/clang/AST/Stmt.h:1962
@@ +1961,3 @@
+  /// \brief The implicit outlined function.
+  FunctionDecl *TheFuncDecl;
+
----------------
Wei Pan wrote:
> Doug Gregor wrote:
> > Interesting. We're actually going to synthesize a FunctionDecl for captured statements? I would have expected that the function would be synthesized entirely in CodeGen, and would never be represented in the AST. Why do we need to represent the function in the AST?
> This FunctionDecl was synthesized during Sema and we marked this function as a capturing region. With this approach, its codegen seems simpler, comparing to the implementation for "CodeGenFunction::GenerateCopyHelperFunction(const CGBlockInfo &blockInfo)" 
> 
> What about we first post our parsing and sema patches? If having this FunctionDecl is not ideal, we would certainly like to remove it out of the AST and generate it during CodeGen.   
Seemly, we do need this FunctionDecl as the DeclContext for anything inside this captured statement, just like Lambda::operator()() or BlockDecl. 


http://llvm-reviews.chandlerc.com/D370