[PATCH] D104745: [llvm-cov] Enforce alignment of function records

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Function Records are required to be aligned on 8 bits. This is enforced for each
records except the first, when one relies on the default alignment within and
std::string. There's no such guarantee, and indeed on 32 bits for some
implementation of std::string this is not enforced.

Provide a portable implementation based on llvm's MemoryBuffer.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D104745

Files:
  llvm/include/llvm/ProfileData/Coverage/CoverageMappingReader.h
  llvm/lib/ProfileData/Coverage/CoverageMappingReader.cpp

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