[compiler] Introduce initial StrictEqualStub.

src/mips64/code-stubs-mips64.cc

Index: src/mips64/code-stubs-mips64.cc
diff --git a/src/mips64/code-stubs-mips64.cc b/src/mips64/code-stubs-mips64.cc
index 1d996ccc0142dd1f19e8898c06d81ca4328c71ca..c2b6429636ed446aca87adcd4b82dbfe2d89dc30 100644
--- a/src/mips64/code-stubs-mips64.cc
+++ b/src/mips64/code-stubs-mips64.cc
@@ -3362,10 +3362,17 @@ void CompareICStub::GenerateStrings(MacroAssembler* masm) {
 
   // Handle more complex cases in runtime.
   __ bind(&runtime);
-  __ Push(left, right);
   if (equality) {
-    __ TailCallRuntime(Runtime::kStringEquals);
+    {
+      FrameScope scope(masm, StackFrame::INTERNAL);
+      __ Push(left, right);
+      __ CallRuntime(Runtime::kStringEqual);
+    }
+    __ LoadRoot(a0, Heap::kTrueValueRootIndex);
+    __ Ret(USE_DELAY_SLOT);
+    __ Subu(v0, v0, a0);  // In delay slot.
   } else {
+    __ Push(left, right);
     __ TailCallRuntime(Runtime::kStringCompare);
   }