David Majnemer d9d02d8259 [CodeGen, TargetPassConfig] Remove a race from createRegAllocPass ...

The createRegAllocPass reads and writes to a global variable 'Registry'
via calls to getDefault and setDefault.  Run this under a call_once to
avoid races.

llvm-svn: 274875

2016-07-08 16:39:00 +00:00

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