Update V8 to r4730 as required by WebKit r60469
diff --git a/src/mips/fast-codegen-mips.cc b/src/mips/fast-codegen-mips.cc
index 48a0ce6..186f9fa 100644
--- a/src/mips/fast-codegen-mips.cc
+++ b/src/mips/fast-codegen-mips.cc
@@ -27,6 +27,8 @@
 
 #include "v8.h"
 
+#if defined(V8_TARGET_ARCH_MIPS)
+
 #include "codegen-inl.h"
 #include "fast-codegen.h"
 
@@ -72,3 +74,4 @@
 
 } }  // namespace v8::internal
 
+#endif  // V8_TARGET_ARCH_MIPS