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from 371257ed10a Delete temp file if rename fails. new 9a320d92847 [PGO] detect infinite loop and form MST properly

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Summary of changes: lib/Transforms/Instrumentation/CFGMST.h | 22 +++++++++- .../Instrumentation/PGOInstrumentation.cpp | 50 ++++++++++++++++------ test/Transforms/PGOProfile/infinite_loop_gen.ll | 18 ++++++++ 3 files changed, 75 insertions(+), 15 deletions(-) create mode 100644 test/Transforms/PGOProfile/infinite_loop_gen.ll