Revert "[SimplifyCFG] Common debug handling [NFC]"

This reverts commit r340997.

This change turned out not to be NFC after all, but e.g. causes
clang to crash when building the linux kernel for aarch64.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@341031 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed