[debugger] Ensure at least one breakable position per function.

src/full-codegen/full-codegen.cc

 // Copyright 2012 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/full-codegen/full-codegen.h"
 
 #include "src/ast/ast.h"
 #include "src/ast/ast-numbering.h"
 #include "src/ast/prettyprinter.h"
 #include "src/ast/scopeinfo.h"
@@ skipping 966 matching lines @@
       LoadContextField(context_register(), Context::PREVIOUS_INDEX);
       --context_length;
     }
     StoreToFrameField(StandardFrameConstants::kContextOffset,
                       context_register());
   }
 
   __ jmp(current->AsBreakable()->break_label());
 }
 
+void FullCodeGenerator::EmitIllegalRedeclaration() {
+  Comment cmnt(masm_, "[ Declarations");
+  Expression* illegal = scope()->GetIllegalRedeclaration();
+  SetExpressionAsStatementPosition(illegal);
+  VisitForEffect(illegal);
+}
+
 void FullCodeGenerator::VisitBreakStatement(BreakStatement* stmt) {
   Comment cmnt(masm_, "[ BreakStatement");
   SetStatementPosition(stmt);
   EmitBreak(stmt->target());
 }
 
 void FullCodeGenerator::EmitUnwindAndReturn() {
   NestedStatement* current = nesting_stack_;
   int context_length = 0;
   while (current != NULL) {
@@ skipping 921 matching lines @@
   return var->mode() == CONST_LEGACY || var->scope()->is_nonlinear() ||
          var->initializer_position() >= proxy->position();
 }
 
 
 #undef __
 
 
 }  // namespace internal
 }  // namespace v8