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

[Kostya Kortchinsky via Phabricator via llvm-commits]

cryptoad added a comment.

And I forgot:

- the `SizeClassInfo` `mutex` should be a `StaticSpinMutex` since it's zero initialized and doesn't need to be "constructed";


Repository:
  rCRT Compiler Runtime

https://reviews.llvm.org/D46657