UnreachableBlockElim could incorrectly return false when it had not modified the CFG, but HAD modified some PHI nodes.  Fixes PR8174.

llvm-svn: 115083
1 file changed
tree: 6ac23900ecb87df9d3289267e7d1dd37ec80eb8b
  1. clang/
  2. compiler-rt/
  3. debuginfo-tests/
  4. libcxx/
  5. lldb/
  6. llvm/