[regexp] Remove unused code

src/s390/interface-descriptors-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/interface-descriptors.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 166 matching lines @@
 
 void ConstructTrampolineDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   // r2 : number of arguments
   // r3 : the target to call
   // r5 : the new target
   Register registers[] = {r3, r5, r2};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
-void RegExpConstructResultDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  Register registers[] = {r4, r3, r2};
-  data->InitializePlatformSpecific(arraysize(registers), registers);
-}
-
 void TransitionElementsKindDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {r2, r3};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
 void AllocateHeapNumberDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   data->InitializePlatformSpecific(0, nullptr, nullptr);
 }
@@ skipping 185 matching lines @@
       r3,  // the JSGeneratorObject to resume
       r4   // the resume mode (tagged)
   };
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_S390