[builtins] Migrate String.fromCharCode to TurboFan code stub.

src/runtime/runtime.h

 // 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.
 
 #ifndef V8_RUNTIME_RUNTIME_H_
 #define V8_RUNTIME_RUNTIME_H_
 
 #include "src/allocation.h"
 #include "src/base/platform/time.h"
 #include "src/objects.h"
@@ skipping 282 matching lines @@
   F(ThrowIteratorResultNotAnObject, 1, 1)           \
   F(ThrowGeneratorRunning, 0, 1)                    \
   F(ThrowStackOverflow, 0, 1)                       \
   F(ThrowWasmError, 2, 1)                           \
   F(PromiseRejectEvent, 3, 1)                       \
   F(PromiseRevokeReject, 1, 1)                      \
   F(StackGuard, 0, 1)                               \
   F(Interrupt, 0, 1)                                \
   F(AllocateInNewSpace, 1, 1)                       \
   F(AllocateInTargetSpace, 2, 1)                    \
+  F(AllocateSeqOneByteString, 1, 1)                 \
+  F(AllocateSeqTwoByteString, 1, 1)                 \
   F(CollectStackTrace, 2, 1)                        \
   F(MessageGetStartPosition, 1, 1)                  \
   F(MessageGetScript, 1, 1)                         \
   F(FormatMessageString, 4, 1)                      \
   F(CallSiteGetFileNameRT, 1, 1)                    \
   F(CallSiteGetFunctionNameRT, 1, 1)                \
   F(CallSiteGetScriptNameOrSourceUrlRT, 1, 1)       \
   F(CallSiteGetMethodNameRT, 1, 1)                  \
   F(CallSiteGetLineNumberRT, 1, 1)                  \
   F(CallSiteGetColumnNumberRT, 1, 1)                \
@@ skipping 840 matching lines @@
 
 class DeclareGlobalsEvalFlag : public BitField<bool, 0, 1> {};
 class DeclareGlobalsNativeFlag : public BitField<bool, 1, 1> {};
 STATIC_ASSERT(LANGUAGE_END == 3);
 class DeclareGlobalsLanguageMode : public BitField<LanguageMode, 2, 2> {};
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_RUNTIME_RUNTIME_H_