Move SafeStack to CodeGen.

It depends on the target machinery, that's not available for
instrumentation passes.

llvm-svn: 258942

llvm/lib/CodeGen/CodeGen.cpp

@@ -68,6 +68,7 @@ void llvm::initializeCodeGen(PassRegistry &Registry) {
   initializeStackColoringPass(Registry);
   initializeStackMapLivenessPass(Registry);
   initializeLiveDebugValuesPass(Registry);
+  initializeSafeStackPass(Registry);
   initializeStackProtectorPass(Registry);
   initializeStackSlotColoringPass(Registry);
   initializeTailDuplicatePassPass(Registry);