[turbofan] Optimize silent hole checks on legacy const context slots.

src/compiler/ast-graph-builder.cc

Index: src/compiler/ast-graph-builder.cc
diff --git a/src/compiler/ast-graph-builder.cc b/src/compiler/ast-graph-builder.cc
index 2d320421f24a56da2a0851bacc8a1e25130bdad1..9b2ce879357b3878612d37727fd437028b7635f4 100644
--- a/src/compiler/ast-graph-builder.cc
+++ b/src/compiler/ast-graph-builder.cc
@@ -2728,16 +2728,10 @@ Node* AstGraphBuilder::BuildRestArgumentsArray(Variable* rest, int index) {
 
 Node* AstGraphBuilder::BuildHoleCheckSilent(Node* value, Node* for_hole,
                                             Node* not_hole) {
-  IfBuilder hole_check(this);
   Node* the_hole = jsgraph()->TheHoleConstant();
   Node* check = NewNode(javascript()->StrictEqual(), value, the_hole);
-  hole_check.If(check);
-  hole_check.Then();
-  environment()->Push(for_hole);
-  hole_check.Else();
-  environment()->Push(not_hole);
-  hole_check.End();
-  return environment()->Pop();
+  return NewNode(common()->Select(kMachAnyTagged, BranchHint::kFalse), check,
+                 for_hole, not_hole);
 }