[turbofan] Remove dead JSIntrinsicLowering::ReduceGetSuperConstructor().

Bug: v8:8015
Change-Id: I8c7d5fce7bdac70a96a05b469c42ac578c9426bc
Reviewed-on: https://chromium-review.googlesource.com/1238177Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56128}

src/compiler/js-intrinsic-lowering.cc

@@ -259,11 +259,6 @@ Reduction JSIntrinsicLowering::ReduceCall(Node* node) {
   return Changed(node);
 }
 
-Reduction JSIntrinsicLowering::ReduceGetSuperConstructor(Node* node) {
-  NodeProperties::ChangeOp(node, javascript()->GetSuperConstructor());
-  return Changed(node);
-}
-
 Reduction JSIntrinsicLowering::Change(Node* node, const Operator* op, Node* a,
                                       Node* b) {
   RelaxControls(node);

src/compiler/js-intrinsic-lowering.h

@@ -57,7 +57,6 @@ class V8_EXPORT_PRIVATE JSIntrinsicLowering final
   Reduction ReduceToObject(Node* node);
   Reduction ReduceToString(Node* node);
   Reduction ReduceCall(Node* node);
-  Reduction ReduceGetSuperConstructor(Node* node);
 
   Reduction Change(Node* node, const Operator* op);
   Reduction Change(Node* node, const Operator* op, Node* a, Node* b);