[intrinsics] Nuke the %_StringCharFromCode intrinsic.

src/full-codegen/x64/full-codegen-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/full-codegen/full-codegen.h"
 #include "src/ast/compile-time-value.h"
 #include "src/ast/scopes.h"
 #include "src/code-factory.h"
@@ skipping 2636 matching lines @@
   __ bind(&non_function_constructor);
   __ LoadRoot(rax, Heap::kObject_stringRootIndex);
 
   // All done.
   __ bind(&done);
 
   context()->Plug(rax);
 }
 
 
-void FullCodeGenerator::EmitStringCharFromCode(CallRuntime* expr) {
-  ZoneList<Expression*>* args = expr->arguments();
-  DCHECK(args->length() == 1);
-
-  VisitForAccumulatorValue(args->at(0));
-
-  Label done;
-  StringCharFromCodeGenerator generator(rax, rbx);
-  generator.GenerateFast(masm_);
-  __ jmp(&done);
-
-  NopRuntimeCallHelper call_helper;
-  generator.GenerateSlow(masm_, call_helper);
-
-  __ bind(&done);
-  context()->Plug(rbx);
-}
-
-
 void FullCodeGenerator::EmitStringCharCodeAt(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK(args->length() == 2);
 
   VisitForStackValue(args->at(0));
   VisitForAccumulatorValue(args->at(1));
 
   Register object = rbx;
   Register index = rax;
   Register result = rdx;
@@ skipping 887 matching lines @@
   DCHECK_EQ(
       isolate->builtins()->OnStackReplacement()->entry(),
       Assembler::target_address_at(call_target_address, unoptimized_code));
   return ON_STACK_REPLACEMENT;
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64