Remove support for legacy const, part 1

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 c6b0048abc071126e0383e252fe28e78e9adbcf4..a10640f1911b40edc9c519f711b03d9c1aa8cdfd 100644
--- a/src/compiler/ast-graph-builder.cc
+++ b/src/compiler/ast-graph-builder.cc
@@ -616,12 +616,6 @@ void AstGraphBuilder::CreateGraphBody(bool stack_check) {
     NewNode(javascript()->CallRuntime(Runtime::kTraceEnter));
   }
 
-  // Visit illegal re-declaration and bail out if it exists.
-  if (scope->HasIllegalRedeclaration()) {
-    VisitForEffect(scope->GetIllegalRedeclaration());
-    return;
-  }
-
   // Visit declarations within the function scope.
   VisitDeclarations(scope->declarations());