Update V8 to r4730 as required by WebKit r60469
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index a7d2834..ba2fe2d 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -27,6 +27,8 @@
 
 #include "v8.h"
 
+#if defined(V8_TARGET_ARCH_IA32)
+
 #include "bootstrapper.h"
 #include "codegen-inl.h"
 #include "debug.h"
@@ -1706,3 +1708,5 @@
 
 
 } }  // namespace v8::internal
+
+#endif  // V8_TARGET_ARCH_IA32