implement __has_feature(address_sanitizer); also use LangOpts.AddressSanitizer instead of CodeGenOpts.AddressSanitizer

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@145054 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/BackendUtil.cpp b/lib/CodeGen/BackendUtil.cpp
index 0410cec..048011d 100644
--- a/lib/CodeGen/BackendUtil.cpp
+++ b/lib/CodeGen/BackendUtil.cpp
@@ -147,7 +147,7 @@
                            addObjCARCOptPass);
   }
 
-  if (CodeGenOpts.AddressSanitizer) {
+  if (LangOpts.AddressSanitizer) {
     PMBuilder.addExtension(PassManagerBuilder::EP_ScalarOptimizerLate,
                            addAddressSanitizerPass);
   }