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[cmake] By default do not build compiler-rt with PGO
Patch by Zhizhou Yang! In his own words: """ Currently compiler-rt doesn't officially support either PGO instrumentation or use PGO profdata to build it. PGO related flags are passed into compiler-rt since rL372209, and causing bugs: 45022, crbug:1018840 This patch adds several checks in compiler-rt to disable PGO related flags and provides a flag to turn on PGO for compiler-rt if needed. """ Differential Revision: https://reviews.llvm.org/D75499
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