[stubs] Port LoadFunctionPrototypeStub to CSA

src/x64/macro-assembler-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 4011 matching lines @@
   movp(result, FieldOperand(map, Map::kConstructorOrBackPointerOffset));
   bind(&loop);
   JumpIfSmi(result, &done, Label::kNear);
   CmpObjectType(result, MAP_TYPE, temp);
   j(not_equal, &done, Label::kNear);
   movp(result, FieldOperand(result, Map::kConstructorOrBackPointerOffset));
   jmp(&loop);
   bind(&done);
 }
 
-
-void MacroAssembler::TryGetFunctionPrototype(Register function, Register result,
-                                             Label* miss) {
-  // Get the prototype or initial map from the function.
-  movp(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.
-  CompareRoot(result, Heap::kTheHoleValueRootIndex);
-  j(equal, miss);
-
-  // If the function does not have an initial map, we're done.
-  Label done;
-  CmpObjectType(result, MAP_TYPE, kScratchRegister);
-  j(not_equal, &done, Label::kNear);
-
-  // Get the prototype from the initial map.
-  movp(result, FieldOperand(result, Map::kPrototypeOffset));
-
-  // All done.
-  bind(&done);
-}
-
-
 void MacroAssembler::SetCounter(StatsCounter* counter, int value) {
   if (FLAG_native_code_counters && counter->Enabled()) {
     Operand counter_operand = ExternalOperand(ExternalReference(counter));
     movl(counter_operand, Immediate(value));
   }
 }
 
 
 void MacroAssembler::IncrementCounter(StatsCounter* counter, int value) {
   DCHECK(value > 0);
@@ skipping 1239 matching lines @@
   movl(rax, dividend);
   shrl(rax, Immediate(31));
   addl(rdx, rax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64