[PATCH] Warn on suspicious use of absolute value function

[Richard Trieu]

  Before suggesting a different absolute value function, check the namespace to see if it is visible.  If it doesn't exist, also give a note with the header to include.

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2224?vs=6591&id=7034#toc

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