Update to V8 with partial snapshots. This is taken from the partial_snapshot branch of V8.
diff --git a/src/macro-assembler.h b/src/macro-assembler.h
index 0fe4328..e33148c 100644
--- a/src/macro-assembler.h
+++ b/src/macro-assembler.h
@@ -86,6 +86,13 @@
#endif
#include "code.h" // must be after assembler_*.h
#include "arm/macro-assembler-arm.h"
+#elif V8_TARGET_ARCH_MIPS
+#include "mips/constants-mips.h"
+#include "assembler.h"
+#include "mips/assembler-mips.h"
+#include "mips/assembler-mips-inl.h"
+#include "code.h" // must be after assembler_*.h
+#include "mips/macro-assembler-mips.h"
#else
#error Unsupported target architecture.
#endif