[PATCH] Simple Generic Lambdas: Chicago Reversion

[Faisal Vali]

  After a line by line review of code over some deep dish, Richard suggested that we break the patch up into:
   1)  C++14 auto return type deduction for non-generic lambdas (which he graciously agreed to harvest out of the current patch)
   2) Implement simple generic lambdas (replacing auto with a template type parameter as soon as we see it be mentioned  - i.e. at the time Sema is ready to create an AutoType for it - to avoid making the parameter pack part of AutoType, and improve diagnostics slightly for decltype(auto)
  3) address capturing and function to pointer conversion.

  This revision is bullet 2 above.

  Thanks!

Hi rsmith, doug.gregor, eli.friedman,

http://llvm-reviews.chandlerc.com/D1174

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1174?vs=4456&id=4475#toc

Files:
  include/clang/AST/ASTContext.h
  include/clang/AST/ASTLambda.h
  include/clang/AST/DeclCXX.h
  include/clang/AST/ExprCXX.h
  include/clang/AST/Type.h
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Sema/DeclSpec.h
  include/clang/Sema/ScopeInfo.h
  include/clang/Sema/Sema.h
  lib/AST/ASTContext.cpp
  lib/AST/ASTDumper.cpp
  lib/AST/ASTImporter.cpp
  lib/AST/DeclCXX.cpp
  lib/AST/ExprCXX.cpp
  lib/CodeGen/CodeGenFunction.cpp
  lib/Parse/ParseDecl.cpp
  lib/Parse/ParseExprCXX.cpp
  lib/Sema/Sema.cpp
  lib/Sema/SemaDecl.cpp
  lib/Sema/SemaDeclCXX.cpp
  lib/Sema/SemaLambda.cpp
  lib/Sema/SemaOverload.cpp
  lib/Sema/SemaStmt.cpp
  lib/Sema/SemaTemplateDeduction.cpp
  lib/Sema/SemaType.cpp
  lib/Sema/TreeTransform.h
  lib/Serialization/ASTReader.cpp
  lib/Serialization/ASTReaderDecl.cpp
  lib/Serialization/ASTWriter.cpp
  test/CXX/dcl.dcl/dcl.spec/dcl.type/dcl.spec.auto/p3-generic-lambda-1y.cpp
  test/CXX/expr/expr.prim/expr.prim.lambda/generic-lambda-unimplemented-1y.cpp
  test/CXX/expr/expr.prim/expr.prim.lambda/p2-generic-lambda-1y.cpp
  test/CXX/expr/expr.prim/expr.prim.lambda/p4-1y.cpp
  test/CXX/expr/expr.prim/expr.prim.lambda/p4.cpp
  test/CXX/expr/expr.prim/expr.prim.lambda/p5-generic-lambda-1y.cpp
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