tree 3dd9117f8475ea78c3fecad2679bf798dc6371e8
parent 0b098754b73f3b96d00ecb1c7605760b11c90298
author Eric Fiselier <eric@efcs.ca> 1556070450 +0000
committer Eric Fiselier <eric@efcs.ca> 1556070450 +0000

Rewrite cxa guard implementation.

This patch does three main things:
  (1) It re-writes the cxa guard implementation to make it testable.
  (2) Adds support for recursive init detection on non-apple platforms.
  (3) It adds a futex based implementation.

The futex based implementation locks and notifies on a per-object basis, unlike the
current implementation which uses a global lock for all objects. Once this patch settles
I'll turn it on by default when supported.

llvm-svn: 359060