Reid Kleckner 5e9819c5bd [Support] Fix a race initializing a static local in MSVC
static local initialization isn't thread safe with MSVC and a race was
reported in PR23817. We can't use std::atomic because it's not trivially
constructible, so instead do some lame volatile global integer
manipulation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239566 91177308-0d34-0410-b5e6-96231b3b80d8
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