[PATCH] Add a truncation warning for values under a bitwise or

[Sam Panzer]

  Fixed the reported false positives.

  It turned out that compound assignment operators were not handled correctly, so they were not subjected to the check for false positives. A test was added for this; all compound assignment operators now behave properly.

http://llvm-reviews.chandlerc.com/D405

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D405?vs=1294&id=1444#toc

Files:
  include/clang/Basic/DiagnosticSemaKinds.td
  lib/Sema/SemaChecking.cpp
  test/Sema/constant-conversion.c
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