[PATCH] D46657: [sanitizer] Minor 32-bit primary improvements

[Kostya Kortchinsky via Phabricator via llvm-commits]

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

For the 32-bit TransferBatch:

- `SetFromArray` callers have bounds `count`, so relax the `CHECK` to `DCHECK`;
- same for `Add`;
- mark `CopyToArray` as `const`;

For the 32-bit Primary:

- `{Dea,A}llocateBatch` are only called from places that check `class_id`, relax the `CHECK` to `DCHECK`;
- same for `AllocateRegion`;
- remove `GetRegionBeginBySizeClass` that is not used;
- use a local variable for the random shuffle state, so that the compiler can use a register instead of reading and writing to the `SizeClassInfo` at every iteration;

For the 32-bit local cache:

- pass the count to drain instead of doing a `Min` everytime which is at times superfluous.


Repository:
  rCRT Compiler Runtime

https://reviews.llvm.org/D46657

Files:
  lib/sanitizer_common/sanitizer_allocator_local_cache.h
  lib/sanitizer_common/sanitizer_allocator_primary32.h

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