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Summary: This adds support in 'opt' to filter pass remarks emitted by optimization passes. A new flag -pass-remarks specifies which passes should emit a diagnostic when LLVMContext::emitOptimizationRemark is invoked. This will allow the front end to simply pass along the regular expression from its own -Rpass flag when launching the backend. Depends on D3227. Reviewers: qcolombet CC: llvm-commits Differential Revision: http://llvm-reviews.chandlerc.com/D3291 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205775 91177308-0d34-0410-b5e6-96231b3b80d8