[turbofan] Optimize JSCallConstruct in typed lowering to direct 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 b99af21f0327e4840da2a07456d54c09187ac6c0..f151c47bfbffe3f38d603adfaea7e04d539e0512 100644
--- a/src/x64/interface-descriptors-x64.cc
+++ b/src/x64/interface-descriptors-x64.cc
@@ -211,6 +211,17 @@ void CallTrampolineDescriptor::InitializePlatformSpecific(
 }
 
 
+void ConstructStubDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  // rax : number of arguments
+  // rdx : the new target
+  // rdi : the target to call
+  // rbx : allocation site or undefined
+  Register registers[] = {rdi, rdx, rax, rbx};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
+
+
 void ConstructTrampolineDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   // rax : number of arguments