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I recently discovered that `.profraw` headers are expected to be 8 byte
aligned.
643ba926c1/llvm/lib/ProfileData/InstrProfReader.cpp (L503-L506)
When function entry coverage mode is used, function counters are single
bytes, so it is likely that the size of the counters section is not 8
byte aligned. We can add padding after the counters section to guarantee
this.
Reviewed By: kyulee, gulfem
Differential Revision: https://reviews.llvm.org/D152479