Roll forward r243250

Roll forward r243250

r243250 appeared to break clang/test/Analysis/dead-store.c on one of the build
slaves, but I couldn't reproduce this failure locally. Probably a false
positive as I saw this test was broken by r243246 or r243247 too but passed
later without people fixing anything.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243253 91177308-0d34-0410-b5e6-96231b3b80d8