Update V8 to r4730 as required by WebKit r60469
diff --git a/src/arm/simulator-arm.cc b/src/arm/simulator-arm.cc
index e4601f3..e72a879 100644
--- a/src/arm/simulator-arm.cc
+++ b/src/arm/simulator-arm.cc
@@ -29,6 +29,8 @@
 #include <cstdarg>
 #include "v8.h"
 
+#if defined(V8_TARGET_ARCH_ARM)
+
 #include "disasm.h"
 #include "assembler.h"
 #include "arm/constants-arm.h"
@@ -2731,3 +2733,5 @@
 } }  // namespace assembler::arm
 
 #endif  // __arm__
+
+#endif  // V8_TARGET_ARCH_ARM