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Summary: This change tries to make the root cause of instrumented profile data merge failures clearer. Previous: $ llvm-profdata merge test_0.profraw test_1.profraw -o test_merged.profdata test_1.profraw: foo: Function count mismatch test_1.profraw: bar: Function count mismatch test_1.profraw: baz: Function count mismatch ... Changed: $ llvm-profdata merge test_0.profraw test_1.profraw -o test_merged.profdata test_1.profraw: foo: Function basic block count change detected (counter mismatch) Make sure that all profile data to be merged is generated from the same binary. test_1.profraw: bar: Function basic block count change detected (counter mismatch) test_1.profraw: baz: Function basic block count change detected (counter mismatch) ... Reviewers: dnovillo, davidxl, bogner Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D14739 llvm-svn: 253384