[stubs] Port LoadFunctionPrototypeStub to CSA

src/mips64/macro-assembler-mips64.cc

Index: src/mips64/macro-assembler-mips64.cc
diff --git a/src/mips64/macro-assembler-mips64.cc b/src/mips64/macro-assembler-mips64.cc
index a20de7bfea5d8cf117fc80772065a9315eb5d6fe..d703133152c6531a8cbd9168836b69d9a6d32361 100644
--- a/src/mips64/macro-assembler-mips64.cc
+++ b/src/mips64/macro-assembler-mips64.cc
@@ -4937,32 +4937,6 @@ 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.
-  ld(result,
-     FieldMemOperand(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.
-  LoadRoot(t8, Heap::kTheHoleValueRootIndex);
-  Branch(miss, eq, result, Operand(t8));
-
-  // If the function does not have an initial map, we're done.
-  Label done;
-  GetObjectType(result, scratch, scratch);
-  Branch(&done, ne, scratch, Operand(MAP_TYPE));
-
-  // Get the prototype from the initial map.
-  ld(result, FieldMemOperand(result, Map::kPrototypeOffset));
-
-  // All done.
-  bind(&done);
-}
-
-
 void MacroAssembler::GetObjectType(Register object,
                                    Register map,
                                    Register type_reg) {