[stubs] Port LoadFunctionPrototypeStub to CSA

src/x87/code-stubs-x87.cc

Index: src/x87/code-stubs-x87.cc
diff --git a/src/x87/code-stubs-x87.cc b/src/x87/code-stubs-x87.cc
index aee0f743c01d481ce51d0403591146657ff50c0d..86734282dd3c83ea5325a123505c216f148e990a 100644
--- a/src/x87/code-stubs-x87.cc
+++ b/src/x87/code-stubs-x87.cc
@@ -281,24 +281,6 @@ void MathPowStub::Generate(MacroAssembler* masm) {
   __ ret(0);
 }
 
-
-void FunctionPrototypeStub::Generate(MacroAssembler* masm) {
-  Label miss;
-  Register receiver = LoadDescriptor::ReceiverRegister();
-  // With careful management, we won't have to save slot and vector on
-  // the stack. Simply handle the possibly missing case first.
-  // TODO(mvstanton): this code can be more efficient.
-  __ cmp(FieldOperand(receiver, JSFunction::kPrototypeOrInitialMapOffset),
-         Immediate(isolate()->factory()->the_hole_value()));
-  __ j(equal, &miss);
-  __ TryGetFunctionPrototype(receiver, eax, ebx, &miss);
-  __ ret(0);
-
-  __ bind(&miss);
-  PropertyAccessCompiler::TailCallBuiltin(
-      masm, PropertyAccessCompiler::MissBuiltin(Code::LOAD_IC));
-}
-
 void RegExpExecStub::Generate(MacroAssembler* masm) {
   // Just jump directly to runtime if native RegExp is not selected at compile
   // time or if regexp entry in generated code is turned off runtime switch or