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

src/ppc/interface-descriptors-ppc.cc

Index: src/ppc/interface-descriptors-ppc.cc
diff --git a/src/ppc/interface-descriptors-ppc.cc b/src/ppc/interface-descriptors-ppc.cc
index 19cbce46f01c867ec43dae0dc58c6c15432d2e9f..cba9275d9066b1d75a6d50f2c5b4095a9b7233d1 100644
--- a/src/ppc/interface-descriptors-ppc.cc
+++ b/src/ppc/interface-descriptors-ppc.cc
@@ -155,9 +155,20 @@ void CallTrampolineDescriptor::InitializePlatformSpecific(
 
 void CallForwardVarargsDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
+  // r3 : number of arguments
+  // r5 : start index (to support rest parameters)
+  // r4 : the target to call
+  Register registers[] = {r4, r3, r5};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
+
+void ConstructForwardVarargsDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  // r3 : number of arguments
+  // r6 : the new target
   // r5 : start index (to support rest parameters)
   // r4 : the target to call
-  Register registers[] = {r4, r5};
+  Register registers[] = {r4, r6, r3, r5};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }