[PATCH] Warn on suspicious use of absolute value function

[Richard Trieu]

  Update the warning, sync to latest revision.  Change wording of warning.  Move function from FunctionDecl to a static function.  Don't use the name of the function to determine if it is an absolute value function.

http://llvm-reviews.chandlerc.com/D2224

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2224?vs=5666&id=6591#toc

Files:
  test/Sema/warn-absolute-value.c
  include/clang/Basic/DiagnosticGroups.td
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Sema/Sema.h
  lib/Sema/SemaChecking.cpp
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