Revert "Correct dwarf unwind information in function epilogue for X86"

This reverts r317100 as it introduced sanitizer-x86_64-linux-autoconf
buildbot failure (build #15606).



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317136 91177308-0d34-0410-b5e6-96231b3b80d8
99 files changed