[intrinsics] Nuke the %_StringCharFromCode intrinsic.

src/full-codegen/s390/full-codegen-s390.cc

 // Copyright 2015 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_S390
 
 #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 2692 matching lines @@
   // Non-JS objects have class null.
   __ bind(&null);
   __ LoadRoot(r2, Heap::kNullValueRootIndex);
 
   // All done.
   __ bind(&done);
 
   context()->Plug(r2);
 }
 
-void FullCodeGenerator::EmitStringCharFromCode(CallRuntime* expr) {
-  ZoneList<Expression*>* args = expr->arguments();
-  DCHECK(args->length() == 1);
-  VisitForAccumulatorValue(args->at(0));
-
-  Label done;
-  StringCharFromCodeGenerator generator(r2, r3);
-  generator.GenerateFast(masm_);
-  __ b(&done);
-
-  NopRuntimeCallHelper call_helper;
-  generator.GenerateSlow(masm_, call_helper);
-
-  __ bind(&done);
-  context()->Plug(r3);
-}
-
 void FullCodeGenerator::EmitStringCharCodeAt(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK(args->length() == 2);
   VisitForStackValue(args->at(0));
   VisitForAccumulatorValue(args->at(1));
 
   Register object = r3;
   Register index = r2;
   Register result = r5;
 
@@ skipping 851 matching lines @@
   DCHECK(kOSRBranchInstruction == br_instr);
 
   DCHECK(interrupt_address ==
          isolate->builtins()->OnStackReplacement()->entry());
   return ON_STACK_REPLACEMENT;
 }
 
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_TARGET_ARCH_S390