[PATCH] Add support for missed and analysis optimization remarks.

[Diego Novillo]

Hi qcolombet,

This adds two new diagnostics: -pass-remarks-missed and
-pass-remarks-analysis. They take the same values as -pass-remarks but
are intended to be triggered in different contexts.

-pass-remarks-missed is used by LLVMContext::emitOptimizationRemarkMissed,
which passes call when they tried to apply a transformation but
couldn't.

-pass-remarks-analysis is used by LLVMContext::emitOptimizationRemarkAnalysis,
which passes call when they want to inform the user about analysis
results.

The patch also adds support in the inliner for the two new remarks and a
test case.

http://reviews.llvm.org/D3682

Files:
  include/llvm/IR/DiagnosticInfo.h
  include/llvm/IR/LLVMContext.h
  lib/IR/DiagnosticInfo.cpp
  lib/IR/LLVMContext.cpp
  lib/IR/LLVMContextImpl.cpp
  lib/IR/LLVMContextImpl.h
  lib/Transforms/IPO/Inliner.cpp
  test/Transforms/Inline/optimization-remarks.ll
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