[PATCH] D44444: [scudo] Add Chunk::getSize, rework Chunk::getUsableSize

[Kostya Kortchinsky via Phabricator via llvm-commits]

cryptoad created this revision.
cryptoad added a reviewer: alekseyshl.
Herald added subscribers: Sanitizers, delcypher.

Using `getActuallyAllocatedSize` from the Combined resulting in mediocre
compiled code, as the `ClassId != 0` predicament was not propagated there,
resulting in additional branches and dead code. Move the logic in the frontend,
which results in better compiled code. Also I think it makes it slightly easier
to distinguish between the size the user requested, and the size that was
actually allocated by the allocator.

`const` a couple of things as well.

This has no functional impact.


Repository:
  rCRT Compiler Runtime

https://reviews.llvm.org/D44444

Files:
  lib/scudo/scudo_allocator.cpp
  lib/scudo/scudo_allocator_combined.h

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