Oilpan: Disable the GC_PLUGIN_IGNORE annotation when compiling with asan.

For some reason having this annotation leads to linker errors on the
oilpan asan build.

obj/third_party/WebKit/Source/modules/libmodules.a(obj/third_party/WebKit/Source/modules/webdatabase/modules.DatabaseSync.o):../../third_party/WebKit/Source/modules/webdatabase/DatabaseSync.cpp:function __unnamed_1: error: undefined reference to '.str'

obj/third_party/WebKit/Source/modules/libmodules.a(obj/third_party/WebKit/Source/modules/webdatabase/modules.DatabaseSync.o):../../third_party/WebKit/Source/modules/webdatabase/DatabaseSync.cpp:function __unnamed_1: error: undefined reference to '.str1'

Kostya, do you have any ideas why this might break the asan build?

R=kcc@chromium.org, vegorov@chromium.org, zerny@chromium.org
BUG=

Review URL: https://codereview.chromium.org/204673002

git-svn-id: svn://svn.chromium.org/blink/trunk@169564 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/heap/Heap.h

@@ -1046,10 +1046,10 @@ T* adoptRefCountedGarbageCollected(T* ptr)
 // ignore a particular class or field when checking for proper usage. When using
 // GC_PLUGIN_IGNORE a bug-number should be provided as an argument where the
 // bug describes what needs to happen to remove the GC_PLUGIN_IGNORE again.
-#if COMPILER(CLANG)
-#define STACK_ALLOCATED()                               \
-    private:                                            \
-        __attribute__((annotate("blink_stack_allocated")))    \
+#if COMPILER(CLANG) && !defined(ADDRESS_SANITIZER)
+#define STACK_ALLOCATED()                                  \
+    private:                                               \
+        __attribute__((annotate("blink_stack_allocated"))) \
         void* operator new(size_t) = delete;
 #define GC_PLUGIN_IGNORE(bug)                           \
     __attribute__((annotate("blink_gc_plugin_ignore")))