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

llvm-svn: 145054
diff --git a/clang/lib/CodeGen/BackendUtil.cpp b/clang/lib/CodeGen/BackendUtil.cpp
index 0410cec..048011d 100644
--- a/clang/lib/CodeGen/BackendUtil.cpp
+++ b/clang/lib/CodeGen/BackendUtil.cpp
@@ -147,7 +147,7 @@
                            addObjCARCOptPass);
   }
 
-  if (CodeGenOpts.AddressSanitizer) {
+  if (LangOpts.AddressSanitizer) {
     PMBuilder.addExtension(PassManagerBuilder::EP_ScalarOptimizerLate,
                            addAddressSanitizerPass);
   }