MIPS: Implement many KeyedStoreStubs using Crankshaft

src/mips/lithium-codegen-mips.h

Index: src/mips/lithium-codegen-mips.h
diff --git a/src/mips/lithium-codegen-mips.h b/src/mips/lithium-codegen-mips.h
index 1d2a65912aa0cbf1a6e17886d66866c45832b581..bb2003f1df63e8cb4599e265236d05497f026bd6 100644
--- a/src/mips/lithium-codegen-mips.h
+++ b/src/mips/lithium-codegen-mips.h
@@ -87,6 +87,10 @@ class LCodeGen BASE_EMBEDDED {
     return !NeedsEagerFrame() && info()->is_deferred_calling();
   }
 
+  RAStatus GetRAState() const {
+    return frame_is_built_ ? kRAHasBeenSaved : kRAHasNotBeenSaved;
+  }
+
   // Support for converting LOperands to assembler types.
   // LOperand must be a register.
   Register ToRegister(LOperand* op) const;