[PATCH] Allow overriding flag names in diagnostics.

[Diego Novillo]

Hi rsmith,

This allows callers of Diags.Report() to override the name of the flag
associated with the diagnostic. This is useful in cases like the -Rpass
flag, where we want the diagnostic to show the name of the pass that
matched the pattern. Instead of showing "... [-Rpass]", this allows
us to show "... [-Rpass=passname]".

http://reviews.llvm.org/D3441

Files:
  include/clang/Basic/Diagnostic.h
  lib/CodeGen/CodeGenAction.cpp
  lib/Frontend/TextDiagnosticPrinter.cpp
  test/Frontend/optimization-remark.c
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