Accept instructions that read undefined values.

This is not supposed to happen, but I have seen the x86 rematter getting
confused when rematerializing partial redefs.

llvm-svn: 127857
1 file changed
tree: 18d00696bacc2b68632bbd35b8c6bb07a8130dee
  1. clang/
  2. compiler-rt/
  3. debuginfo-tests/
  4. libcxx/
  5. lldb/
  6. llvm/