Revert "r306529 - [X86] Correct dwarf unwind information in function epilogue"

I am 99% sure that this breaks the PPC ASAN build bot:
http://lab.llvm.org:8011/builders/sanitizer-ppc64be-linux/builds/3112/steps/64-bit%20check-asan/logs/stdio

If it doesn't go back to green, we can recommit (and fix the original
commit message at the same time :) ).

llvm-svn: 306676

llvm/lib/CodeGen/CodeGen.cpp

@@ -24,8 +24,6 @@ void llvm::initializeCodeGen(PassRegistry &Registry) {
   initializeBranchCoalescingPass(Registry);
   initializeBranchFolderPassPass(Registry);
   initializeBranchRelaxationPass(Registry);
-  initializeCFIInfoVerifierPass(Registry);
-  initializeCFIInstrInserterPass(Registry);
   initializeCodeGenPreparePass(Registry);
   initializeCountingFunctionInserterPass(Registry);
   initializeDeadMachineInstructionElimPass(Registry);