[PATCH] D137820: [MemoryBuffer] Allow optionally specifying desired buffer alignment

[River Riddle via Phabricator via llvm-commits]

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Underlying data may have requirements/expectations/etc. about
the run-time alignment. WritableMemoryBuffer currently uses
a 16 byte alignment, which works for many situations but not all.
Allowing a desired alignment makes it easier to reuse WritableMemoryBuffer
in situations of special alignment, and also removes a problem when
opening files with special alignment constraints. Large files generally
get mmaped, which has ~page alignment, but small files go through
WritableMemoryBuffer which has the much smaller alignment guarantee.

Depends on D137764 <https://reviews.llvm.org/D137764>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D137820

Files:
  llvm/include/llvm/Support/MemoryBuffer.h
  llvm/lib/Support/MemoryBuffer.cpp
  llvm/unittests/Support/MemoryBufferTest.cpp

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