Introduce a code stub version of Array.prototype.push

src/crankshaft/mips64/lithium-codegen-mips64.cc

Index: src/crankshaft/mips64/lithium-codegen-mips64.cc
diff --git a/src/crankshaft/mips64/lithium-codegen-mips64.cc b/src/crankshaft/mips64/lithium-codegen-mips64.cc
index daa7367f87fd4ee23b3783b0f995daeedfe0bd9a..ea3a062e3561d9eff67c4edde31d456ebe2e3714 100644
--- a/src/crankshaft/mips64/lithium-codegen-mips64.cc
+++ b/src/crankshaft/mips64/lithium-codegen-mips64.cc
@@ -3165,7 +3165,7 @@ void LCodeGen::DoArgumentsElements(LArgumentsElements* instr) {
 
   if (instr->hydrogen()->from_inlined()) {
     __ Dsubu(result, sp, 2 * kPointerSize);
-  } else {
+  } else if (instr->hydrogen()->arguments_adaptor()) {
     // Check if the calling frame is an arguments adaptor frame.
     Label done, adapted;
     __ ld(scratch, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
@@ -3177,6 +3177,8 @@ void LCodeGen::DoArgumentsElements(LArgumentsElements* instr) {
     // frame below the adaptor frame if adapted.
     __ Movn(result, fp, temp);  // Move only if temp is not equal to zero (ne).
     __ Movz(result, scratch, temp);  // Move only if temp is equal to zero (eq).
+  } else {
+    __ mov(result, fp);
   }
 }