A64: Synchronize with r16356.

src/checks.h

Index: src/checks.h
diff --git a/src/checks.h b/src/checks.h
index 50e4b4004501ebf69bc23aa0da27765592a0d084..3b283831ed03e2c3b63a8ae1f9670a24f0390d95 100644
--- a/src/checks.h
+++ b/src/checks.h
@@ -31,6 +31,7 @@
 #include <string.h>
 
 #include "../include/v8stdint.h"
+
 extern "C" void V8_Fatal(const char* file, int line, const char* format, ...);
 
 // Define custom A64 preprocessor helpers to facilitate development.
@@ -300,7 +301,7 @@ inline void CheckNonEqualsHelper(const char* file,
 
 // Use C++11 static_assert if possible, which gives error
 // messages that are easier to understand on first sight.
-#if __cplusplus >= 201103L
+#if V8_HAS_CXX11_STATIC_ASSERT
 #define STATIC_CHECK(test) static_assert(test, #test)
 #else
 // This is inspired by the static assertion facility in boost.  This