[PATCH] -Wcomma, a new warning for questionable uses of the comma operator

[Richard Trieu]

Add a note to the warning that it can be silenced by casting the left hand expression to void.
Catch a few more cases involving templates.

http://reviews.llvm.org/D3976

Files:
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Sema/Sema.h
  lib/Sema/SemaExpr.cpp
  lib/Sema/SemaOverload.cpp
  test/SemaCXX/warn-comma-operator.cpp
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