A64: Synchronize with r16679.

src/platform/mutex.h

Index: src/platform/mutex.h
diff --git a/src/platform/mutex.h b/src/platform/mutex.h
index ff519b9f0832fe24cdb1ae8e861f7203fd0be957..0f899ca59764bc7563a4b63d45d051d4db7c089a 100644
--- a/src/platform/mutex.h
+++ b/src/platform/mutex.h
@@ -81,10 +81,10 @@ class Mutex V8_FINAL {
   typedef CRITICAL_SECTION NativeHandle;
 #endif
 
-  NativeHandle& native_handle() V8_WARN_UNUSED_RESULT {
+  NativeHandle& native_handle() {
     return native_handle_;
   }
-  const NativeHandle& native_handle() const V8_WARN_UNUSED_RESULT {
+  const NativeHandle& native_handle() const {
     return native_handle_;
   }
 
@@ -94,14 +94,14 @@ class Mutex V8_FINAL {
   int level_;
 #endif
 
-  V8_INLINE(void AssertHeldAndUnmark()) {
+  V8_INLINE void AssertHeldAndUnmark() {
 #ifdef DEBUG
     ASSERT_EQ(1, level_);
     level_--;
 #endif
   }
 
-  V8_INLINE(void AssertUnheldAndMark()) {
+  V8_INLINE void AssertUnheldAndMark() {
 #ifdef DEBUG
     ASSERT_EQ(0, level_);
     level_++;
@@ -177,10 +177,10 @@ class RecursiveMutex V8_FINAL {
   // The implementation-defined native handle type.
   typedef Mutex::NativeHandle NativeHandle;
 
-  NativeHandle& native_handle() V8_WARN_UNUSED_RESULT {
+  NativeHandle& native_handle() {
     return native_handle_;
   }
-  const NativeHandle& native_handle() const V8_WARN_UNUSED_RESULT {
+  const NativeHandle& native_handle() const {
     return native_handle_;
   }