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

src/code-stub-assembler.h

 // Copyright 2016 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_CODE_STUB_ASSEMBLER_H_
 #define V8_CODE_STUB_ASSEMBLER_H_
 
 #include "src/compiler/code-assembler.h"
 #include "src/objects.h"
 
@@ skipping 37 matching lines @@
   compiler::Node* Float64Round(compiler::Node* x);
   compiler::Node* Float64Trunc(compiler::Node* x);
 
   // Tag a Word as a Smi value.
   compiler::Node* SmiTag(compiler::Node* value);
   // Untag a Smi value as a Word.
   compiler::Node* SmiUntag(compiler::Node* value);
 
   // Smi conversions.
   compiler::Node* SmiToFloat64(compiler::Node* value);
+  compiler::Node* SmiFromWord(compiler::Node* value) { return SmiTag(value); }
   compiler::Node* SmiFromWord32(compiler::Node* value);
   compiler::Node* SmiToWord(compiler::Node* value) { return SmiUntag(value); }
   compiler::Node* SmiToWord32(compiler::Node* value);
 
   // Smi operations.
   compiler::Node* SmiAdd(compiler::Node* a, compiler::Node* b);
   compiler::Node* SmiAddWithOverflow(compiler::Node* a, compiler::Node* b);
   compiler::Node* SmiSub(compiler::Node* a, compiler::Node* b);
   compiler::Node* SmiSubWithOverflow(compiler::Node* a, compiler::Node* b);
   compiler::Node* SmiEqual(compiler::Node* a, compiler::Node* b);
@@ skipping 100 matching lines @@
   compiler::Node* StoreFixedDoubleArrayElement(
       compiler::Node* object, compiler::Node* index, compiler::Node* value,
       ParameterMode parameter_mode = INTEGER_PARAMETERS);
 
   // Allocate a HeapNumber without initializing its value.
   compiler::Node* AllocateHeapNumber();
   // Allocate a HeapNumber with a specific value.
   compiler::Node* AllocateHeapNumberWithValue(compiler::Node* value);
   // Allocate a SeqOneByteString with the given length.
   compiler::Node* AllocateSeqOneByteString(int length);
+  compiler::Node* AllocateSeqOneByteString(compiler::Node* context,
+                                           compiler::Node* length);
   // Allocate a SeqTwoByteString with the given length.
   compiler::Node* AllocateSeqTwoByteString(int length);
+  compiler::Node* AllocateSeqTwoByteString(compiler::Node* context,
+                                           compiler::Node* length);
   // Allocated an JSArray
   compiler::Node* AllocateJSArray(ElementsKind kind, compiler::Node* array_map,
                                   compiler::Node* capacity,
                                   compiler::Node* length,
                                   compiler::Node* allocation_site = nullptr,
                                   ParameterMode mode = INTEGER_PARAMETERS);
 
   // Allocation site manipulation
   void InitializeAllocationMemento(compiler::Node* base_allocation,
                                    int base_allocation_size,
@@ skipping 67 matching lines @@
                                        compiler::Node* top_adddress,
                                        compiler::Node* limit_address);
 
   static const int kElementLoopUnrollThreshold = 8;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CODE_STUB_ASSEMBLER_H_