[turbofan] Optimize JSCallConstruct in typed lowering to direct calls.

src/interface-descriptors.h

Index: src/interface-descriptors.h
diff --git a/src/interface-descriptors.h b/src/interface-descriptors.h
index 82c6fdc6cf9608a2dafe02fc5d6e0d513ece01a8..0e21cde89dcb48da14a5545c5e101a339c682e07 100644
--- a/src/interface-descriptors.h
+++ b/src/interface-descriptors.h
@@ -41,6 +41,7 @@ class PlatformInterfaceDescriptor;
   V(CallFunctionWithFeedbackAndVector)        \
   V(CallConstruct)                            \
   V(CallTrampoline)                           \
+  V(ConstructStub)                            \
   V(ConstructTrampoline)                      \
   V(RegExpConstructResult)                    \
   V(TransitionElementsKind)                   \
@@ -474,6 +475,13 @@ class CallTrampolineDescriptor : public CallInterfaceDescriptor {
 };
 
 
+class ConstructStubDescriptor : public CallInterfaceDescriptor {
+ public:
+  DECLARE_DESCRIPTOR_WITH_CUSTOM_FUNCTION_TYPE(ConstructStubDescriptor,
+                                               CallInterfaceDescriptor)
+};
+
+
 class ConstructTrampolineDescriptor : public CallInterfaceDescriptor {
  public:
   DECLARE_DESCRIPTOR_WITH_CUSTOM_FUNCTION_TYPE(ConstructTrampolineDescriptor,