[OptDiag] Split code region out of DiagnosticInfoOptimizationBase
Code region is the only part of this class that is IR-specific. Code
region is moved down in the inheritance tree to a new derived class,
called DiagnosticInfoIROptimization.
All the existing remarks are derived from this new class now.
This allows the new MIR pass-remark classes to be derived from
DiagnosticInfoOptimizationBase.
Also because we keep the name DiagnosticInfoOptimizationBase, the clang
parts don't need any adjustment.
Differential Revision: https://reviews.llvm.org/D29003
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@293109
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