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8f7fca4891
Summary: This patch introduces error handling to propagate the errors from llvm-mca library classes (or what will become library classes) up to the driver. This patch also introduces an enum to make clearer the intention of the return value for Stage::execute. This supports PR38101. Reviewers: andreadb, courbet, RKSimon Reviewed By: andreadb Subscribers: llvm-commits, tschuett, gbedwell Differential Revision: https://reviews.llvm.org/D50561 llvm-svn: 339594