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

[Sam Panzer]

  Making this diagnostic work for bitwise and, without adding any extra diagnostics, was trickier than expected.

  I also tried rephrasing the warning to underline which of the operands will probably misbehave, though it probably still needs work.

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D405?vs=1070&id=1121#toc

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