PPC/s390: [turbofan] Avoid allocating rest parameters for spread calls.

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 127 matching lines @@
 void CallTrampolineDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   // r2 : number of arguments
   // r3 : the target to call
   Register registers[] = {r3, r2};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
 void CallForwardVarargsDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
+  // r2 : number of arguments
   // r4 : start index (to support rest parameters)
   // r3 : the target to call
-  Register registers[] = {r3, r4};
+  Register registers[] = {r3, r2, r4};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
+void ConstructForwardVarargsDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  // r2 : number of arguments
+  // r5 : the new target
+  // r4 : start index (to support rest parameters)
+  // r3 : the target to call
+  Register registers[] = {r3, r5, r2, r4};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
+
 void ConstructStubDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   // r2 : number of arguments
   // r3 : the target to call
   // r5 : the new target
   // r4 : allocation site or undefined
   Register registers[] = {r3, r5, r2, r4};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
@@ skipping 188 matching lines @@
   Register registers[] = {
       r3,  // loaded new FP
   };
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_S390