[turbofan]: Convert StringFromCharCode to var-args style TF builtin

src/interface-descriptors.h

 // 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.
 
 #ifndef V8_CALL_INTERFACE_DESCRIPTOR_H_
 #define V8_CALL_INTERFACE_DESCRIPTOR_H_
 
 #include <memory>
 
 #include "src/assembler.h"
@@ skipping 44 matching lines @@
   V(AllocateFloat32x4)                    \
   V(AllocateInt32x4)                      \
   V(AllocateUint32x4)                     \
   V(AllocateBool32x4)                     \
   V(AllocateInt16x8)                      \
   V(AllocateUint16x8)                     \
   V(AllocateBool16x8)                     \
   V(AllocateInt8x16)                      \
   V(AllocateUint8x16)                     \
   V(AllocateBool8x16)                     \
+  V(Builtin)                              \
   V(ArrayNoArgumentConstructor)           \
   V(ArraySingleArgumentConstructor)       \
   V(ArrayNArgumentsConstructor)           \
   V(Compare)                              \
   V(BinaryOp)                             \
   V(BinaryOpWithAllocationSite)           \
   V(BinaryOpWithVector)                   \
   V(CountOp)                              \
   V(StringAdd)                            \
   V(StringCompare)                        \
@@ skipping 515 matching lines @@
 };
 
 #define SIMD128_ALLOC_DESC(TYPE, Type, type, lane_count, lane_type)         \
   class Allocate##Type##Descriptor : public CallInterfaceDescriptor {       \
    public:                                                                  \
     DECLARE_DESCRIPTOR(Allocate##Type##Descriptor, CallInterfaceDescriptor) \
   };
 SIMD128_TYPES(SIMD128_ALLOC_DESC)
 #undef SIMD128_ALLOC_DESC
 
+class BuiltinDescriptor : public CallInterfaceDescriptor {
+ public:
+  DEFINE_PARAMETERS(kNewTarget, kArgumentsCount)
+  DECLARE_DESCRIPTOR_WITH_CUSTOM_FUNCTION_TYPE(BuiltinDescriptor,
+                                               CallInterfaceDescriptor)
+  static const Register ArgumentsCountRegister();
+  static const Register NewTargetRegister();
+};
+
 class ArrayNoArgumentConstructorDescriptor : public CallInterfaceDescriptor {
  public:
   DEFINE_PARAMETERS(kFunction, kAllocationSite, kActualArgumentsCount,
                     kFunctionParameter)
   DECLARE_DESCRIPTOR_WITH_CUSTOM_FUNCTION_TYPE(
       ArrayNoArgumentConstructorDescriptor, CallInterfaceDescriptor)
 };
 
 class ArraySingleArgumentConstructorDescriptor
     : public CallInterfaceDescriptor {
@@ skipping 207 matching lines @@
 }  // namespace v8
 
 
 #if V8_TARGET_ARCH_ARM64
 #include "src/arm64/interface-descriptors-arm64.h"
 #elif V8_TARGET_ARCH_ARM
 #include "src/arm/interface-descriptors-arm.h"
 #endif
 
 #endif  // V8_CALL_INTERFACE_DESCRIPTOR_H_