[PATCH] D26057: [coroutines] Add CoawaitDependentExpr AST node and use it to properly build await_transform.

[Eric Fiselier via cfe-commits]

EricWF created this revision.
EricWF added reviewers: rsmith, GorNishanov.
EricWF added subscribers: cfe-commits, rsmith.
Herald added a subscriber: mehdi_amini.

This patch has two primary changes:

1. Defines a new AST node `CoawaitDependentExpr` for representing co_await expressions while the promise type is still dependent.
2. Correctly detect and transform the 'co_await' operand to  `p.await_transform(<expr>)`  when possible.

@rsmith: Please let me know if I missed any boiler plate that goes along with adding an AST node.


https://reviews.llvm.org/D26057

Files:
  include/clang/AST/ExprCXX.h
  include/clang/AST/RecursiveASTVisitor.h
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Basic/StmtNodes.td
  include/clang/Sema/Sema.h
  lib/AST/Expr.cpp
  lib/AST/ExprClassification.cpp
  lib/AST/ExprConstant.cpp
  lib/AST/ItaniumMangle.cpp
  lib/AST/StmtPrinter.cpp
  lib/AST/StmtProfile.cpp
  lib/Sema/SemaCoroutine.cpp
  lib/Sema/SemaExceptionSpec.cpp
  lib/Sema/TreeTransform.h
  lib/Serialization/ASTReaderStmt.cpp
  lib/Serialization/ASTWriterStmt.cpp
  lib/StaticAnalyzer/Core/ExprEngine.cpp
  test/SemaCXX/coroutines.cpp
  tools/libclang/CXCursor.cpp

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