[asan] Mac: do not link dynamic libs with the asan-rt, use -undefined dynamic_lookup for dynamic libs. Style fixes. Patch by glider@google.com 

llvm-svn: 145955
diff --git a/clang/lib/Driver/ToolChains.cpp b/clang/lib/Driver/ToolChains.cpp
index 245b3e8..77831be 100644
--- a/clang/lib/Driver/ToolChains.cpp
+++ b/clang/lib/Driver/ToolChains.cpp
@@ -467,9 +467,12 @@
     }
   }
 
-  // Add ASAN runtime library, if required.
+  // Add ASAN runtime library, if required. Dynamic libraries and bundles
+  // should not be linked with the runtime library.
   if (Args.hasFlag(options::OPT_faddress_sanitizer,
                    options::OPT_fno_address_sanitizer, false)) {
+    if (Args.hasArg(options::OPT_dynamiclib) ||
+        Args.hasArg(options::OPT_bundle)) return;
     if (isTargetIPhoneOS()) {
       getDriver().Diag(diag::err_drv_clang_unsupported_per_platform)
         << "-faddress-sanitizer";