[intrinsics] Nuke the %_StringCharFromCode intrinsic.

src/full-codegen/arm64/full-codegen-arm64.cc

 // Copyright 2013 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_ARM64
 
 #include "src/full-codegen/full-codegen.h"
 #include "src/ast/compile-time-value.h"
 #include "src/ast/scopes.h"
 #include "src/code-factory.h"
@@ skipping 2667 matching lines @@
   __ Bind(&null);
   __ LoadRoot(x0, Heap::kNullValueRootIndex);
 
   // All done.
   __ Bind(&done);
 
   context()->Plug(x0);
 }
 
 
-void FullCodeGenerator::EmitStringCharFromCode(CallRuntime* expr) {
-  ZoneList<Expression*>* args = expr->arguments();
-  DCHECK(args->length() == 1);
-
-  VisitForAccumulatorValue(args->at(0));
-
-  Label done;
-  Register code = x0;
-  Register result = x1;
-
-  StringCharFromCodeGenerator generator(code, result);
-  generator.GenerateFast(masm_);
-  __ B(&done);
-
-  NopRuntimeCallHelper call_helper;
-  generator.GenerateSlow(masm_, call_helper);
-
-  __ Bind(&done);
-  context()->Plug(result);
-}
-
-
 void FullCodeGenerator::EmitStringCharCodeAt(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK(args->length() == 2);
 
   VisitForStackValue(args->at(0));
   VisitForAccumulatorValue(args->at(1));
 
   Register object = x1;
   Register index = x0;
   Register result = x3;
@@ skipping 1044 matching lines @@
   }
 
   return INTERRUPT;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64