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

src/s390/interface-descriptors-s390.cc

Index: src/s390/interface-descriptors-s390.cc
diff --git a/src/s390/interface-descriptors-s390.cc b/src/s390/interface-descriptors-s390.cc
index 031ccafe6f6fb60193c55c6c06364c7b9f65a9c3..0028b9578b35d89286b835787cca76bbe4837940 100644
--- a/src/s390/interface-descriptors-s390.cc
+++ b/src/s390/interface-descriptors-s390.cc
@@ -145,9 +145,20 @@ void CallTrampolineDescriptor::InitializePlatformSpecific(
 
 void CallForwardVarargsDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
+  // r2 : number of arguments
+  // r4 : start index (to support rest parameters)
+  // r3 : the target to call
+  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, r4};
+  Register registers[] = {r3, r5, r2, r4};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }