Remove support for legacy const, part 1

src/compiler/ast-graph-builder.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/ast-graph-builder.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler.h"
 #include "src/compiler/ast-loop-assignment-analyzer.h"
 #include "src/compiler/control-builders.h"
@@ skipping 598 matching lines @@
   BuildThisFunctionVariable(scope->this_function_var());
 
   // Build assignment to {new.target} variable if it is used.
   BuildNewTargetVariable(scope->new_target_var());
 
   // Emit tracing call if requested to do so.
   if (FLAG_trace) {
     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());
 
   // Build a stack-check before the body.
   if (stack_check) {
     Node* node = NewNode(javascript()->StackCheck());
     PrepareFrameState(node, BailoutId::FunctionEntry());
   }
 
   // Visit statements in the function body.
@@ skipping 3738 matching lines @@
     // Phi does not exist yet, introduce one.
     value = NewPhi(inputs, value, control);
     value->ReplaceInput(inputs - 1, other);
   }
   return value;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8