Revert of [intrinsic] Drop the %_ValueOf intrinsic.

src/full-codegen/mips64/full-codegen-mips64.cc

Index: src/full-codegen/mips64/full-codegen-mips64.cc
diff --git a/src/full-codegen/mips64/full-codegen-mips64.cc b/src/full-codegen/mips64/full-codegen-mips64.cc
index d1ec8f3c9d155964403c94b2f3451bf1d0965cda..ebaec584e3a04b04ec5f2acadf78831bc2561d05 100644
--- a/src/full-codegen/mips64/full-codegen-mips64.cc
+++ b/src/full-codegen/mips64/full-codegen-mips64.cc
@@ -2855,6 +2855,26 @@
   // All done.
   __ bind(&done);
 
+  context()->Plug(v0);
+}
+
+
+void FullCodeGenerator::EmitValueOf(CallRuntime* expr) {
+  ZoneList<Expression*>* args = expr->arguments();
+  DCHECK(args->length() == 1);
+
+  VisitForAccumulatorValue(args->at(0));  // Load the object.
+
+  Label done;
+  // If the object is a smi return the object.
+  __ JumpIfSmi(v0, &done);
+  // If the object is not a value type, return the object.
+  __ GetObjectType(v0, a1, a1);
+  __ Branch(&done, ne, a1, Operand(JS_VALUE_TYPE));
+
+  __ ld(v0, FieldMemOperand(v0, JSValue::kValueOffset));
+
+  __ bind(&done);
   context()->Plug(v0);
 }