Duncan P. N. Exon Smith 9e4a11f46c IR: Fix a use-after-free in RAUW
Happened pretty commonly during `LLVMContext` teardown when `clang -g`
hit an error.  This fixes the use-after-free.  Next I'll clean up
teardown so that it's not RAUW'ing when metadata-tracked values are
deleted (only really causes a problem if the graph is mid-construction
when teardown starts, but it's still unnecessary work).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226029 91177308-0d34-0410-b5e6-96231b3b80d8
2015-01-14 19:56:10 +00:00
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