Update V8 to r4730 as required by WebKit r60469
diff --git a/src/mips/disasm-mips.cc b/src/mips/disasm-mips.cc
index cab72d1..959a4a2 100644
--- a/src/mips/disasm-mips.cc
+++ b/src/mips/disasm-mips.cc
@@ -57,6 +57,8 @@
 
 #include "v8.h"
 
+#if defined(V8_TARGET_ARCH_MIPS)
+
 #include "constants-mips.h"
 #include "disasm.h"
 #include "macro-assembler.h"
@@ -782,3 +784,4 @@
 
 }  // namespace disasm
 
+#endif  // V8_TARGET_ARCH_MIPS