Unbreak MIPS part a bit.

src/mips/assembler-mips-inl.h

Index: src/mips/assembler-mips-inl.h
diff --git a/src/mips/assembler-mips-inl.h b/src/mips/assembler-mips-inl.h
index 3e726a754584432d4fce84452ee1a93101d51d7b..123e2928283e12700d4126f89422acbe3ac6f1b0 100644
--- a/src/mips/assembler-mips-inl.h
+++ b/src/mips/assembler-mips-inl.h
@@ -292,6 +292,17 @@ bool RelocInfo::IsPatchedDebugBreakSlotSequence() {
 }
 
 
+Code* RelocInfo::code_age_stub() {
+  UNIMPLEMENTED();
+  return NULL;
+}
+
+
+void RelocInfo::set_code_age_stub(Code* stub) {
+  UNIMPLEMENTED();
+}
+
+
 void RelocInfo::Visit(ObjectVisitor* visitor) {
   RelocInfo::Mode mode = rmode();
   if (mode == RelocInfo::EMBEDDED_OBJECT) {