[stubs] Port LoadFunctionPrototypeStub to CSA

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index 897f970240dc5271ef9aa2c543eb4e89dde7ffaf..9f8620194fa5d2325e1719a58718a2efc4e3f2d6 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -1690,32 +1690,6 @@ void MacroAssembler::GetMapConstructor(Register result, Register map,
   bind(&done);
 }
 
-
-void MacroAssembler::TryGetFunctionPrototype(Register function, Register result,
-                                             Register scratch, Label* miss) {
-  // Get the prototype or initial map from the function.
-  mov(result,
-      FieldOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
-
-  // If the prototype or initial map is the hole, don't return it and
-  // simply miss the cache instead. This will allow us to allocate a
-  // prototype object on-demand in the runtime system.
-  cmp(result, Immediate(isolate()->factory()->the_hole_value()));
-  j(equal, miss);
-
-  // If the function does not have an initial map, we're done.
-  Label done;
-  CmpObjectType(result, MAP_TYPE, scratch);
-  j(not_equal, &done, Label::kNear);
-
-  // Get the prototype from the initial map.
-  mov(result, FieldOperand(result, Map::kPrototypeOffset));
-
-  // All done.
-  bind(&done);
-}
-
-
 void MacroAssembler::CallStub(CodeStub* stub, TypeFeedbackId ast_id) {
   DCHECK(AllowThisStubCall(stub));  // Calls are not allowed in some stubs.
   call(stub->GetCode(), RelocInfo::CODE_TARGET, ast_id);