[PATCH] New warning -Wpessimizing-move to catch when removing calls to std::move prevent optimization

[Richard Trieu]

Consolidate the checking to SemaInit.cpp
Ass warning for redundant move on return


http://reviews.llvm.org/D7633

Files:
  include/clang/Basic/DiagnosticGroups.td
  include/clang/Basic/DiagnosticSemaKinds.td
  lib/Sema/SemaInit.cpp
  test/SemaCXX/warn-pessmizing-move.cpp
  test/SemaCXX/warn-redundant-move.cpp

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