[turbofan] Avoid allocating rest parameters for spread calls.

src/x64/interface-descriptors-x64.cc

Index: src/x64/interface-descriptors-x64.cc
diff --git a/src/x64/interface-descriptors-x64.cc b/src/x64/interface-descriptors-x64.cc
index 04ecff5fbbc6315656dfb299ac95c337dd1ea8ff..b6ab7ca1af4dd3fa262ea147647e883a62dabe96 100644
--- a/src/x64/interface-descriptors-x64.cc
+++ b/src/x64/interface-descriptors-x64.cc
@@ -155,9 +155,20 @@ void CallTrampolineDescriptor::InitializePlatformSpecific(
 
 void CallForwardVarargsDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
+  // rax : number of arguments
+  // rcx : start index (to support rest parameters)
+  // rdi : the target to call
+  Register registers[] = {rdi, rax, rcx};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
+
+void ConstructForwardVarargsDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  // rax : number of arguments
+  // rdx : the new target
   // rcx : start index (to support rest parameters)
   // rdi : the target to call
-  Register registers[] = {rdi, rcx};
+  Register registers[] = {rdi, rdx, rax, rcx};
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }