[runtime] Drop redundant %CharFromCode runtime entry.

src/runtime/runtime-strings.cc

 // Copyright 2014 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.
 
 #include "src/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/conversions-inl.h"
 #include "src/isolate-inl.h"
 #include "src/regexp/jsregexp-inl.h"
@@ skipping 387 matching lines @@
   subject = String::Flatten(subject);
 
   if (i >= static_cast<uint32_t>(subject->length())) {
     return isolate->heap()->nan_value();
   }
 
   return Smi::FromInt(subject->Get(i));
 }
 
 
-RUNTIME_FUNCTION(Runtime_CharFromCode) {
-  HandleScope handlescope(isolate);
-  DCHECK(args.length() == 1);
-  if (args[0]->IsNumber()) {
-    CONVERT_NUMBER_CHECKED(uint32_t, code, Uint32, args[0]);
-    code &= 0xffff;
-    return *isolate->factory()->LookupSingleCharacterStringFromCode(code);
-  }
-  return isolate->heap()->empty_string();
-}
-
-
 RUNTIME_FUNCTION(Runtime_StringCompare) {
   HandleScope handle_scope(isolate);
   DCHECK_EQ(2, args.length());
   CONVERT_ARG_HANDLE_CHECKED(String, x, 0);
   CONVERT_ARG_HANDLE_CHECKED(String, y, 1);
   isolate->counters()->string_compare_runtime()->Increment();
   switch (String::Compare(x, y)) {
     case ComparisonResult::kLessThan:
       return Smi::FromInt(LESS);
     case ComparisonResult::kEqual:
@@ skipping 748 matching lines @@
 
 RUNTIME_FUNCTION(Runtime_FlattenString) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(String, str, 0);
   return *String::Flatten(str);
 }
 
 
 RUNTIME_FUNCTION(Runtime_StringCharFromCode) {
-  SealHandleScope shs(isolate);
-  return __RT_impl_Runtime_CharFromCode(args, isolate);
+  HandleScope handlescope(isolate);
+  DCHECK_EQ(1, args.length());
+  if (args[0]->IsNumber()) {
+    CONVERT_NUMBER_CHECKED(uint32_t, code, Uint32, args[0]);
+    code &= 0xffff;
+    return *isolate->factory()->LookupSingleCharacterStringFromCode(code);
+  }
+  return isolate->heap()->empty_string();
 }
 
 
 RUNTIME_FUNCTION(Runtime_StringCharAt) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 2);
   if (!args[0]->IsString()) return Smi::FromInt(0);
   if (!args[1]->IsNumber()) return Smi::FromInt(0);
   if (std::isinf(args.number_at(1))) return isolate->heap()->empty_string();
   Object* code = __RT_impl_Runtime_StringCharCodeAtRT(args, isolate);
   if (code->IsNaN()) return isolate->heap()->empty_string();
-  return __RT_impl_Runtime_CharFromCode(Arguments(1, &code), isolate);
+  return __RT_impl_Runtime_StringCharFromCode(Arguments(1, &code), isolate);
 }
 
 
 RUNTIME_FUNCTION(Runtime_OneByteSeqStringGetChar) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 2);
   CONVERT_ARG_CHECKED(SeqOneByteString, string, 0);
   CONVERT_INT32_ARG_CHECKED(index, 1);
   return Smi::FromInt(string->SeqOneByteStringGet(index));
 }
@@ skipping 41 matching lines @@
 
 
 RUNTIME_FUNCTION(Runtime_StringGetLength) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(String, s, 0);
   return Smi::FromInt(s->length());
 }
 }  // namespace internal
 }  // namespace v8