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

src/full-codegen/full-codegen.cc

Index: src/full-codegen/full-codegen.cc
diff --git a/src/full-codegen/full-codegen.cc b/src/full-codegen/full-codegen.cc
index 1c7a02bf12fa6c06790176493fb59c77c779f4b0..e3a7e6696624f6f8b2e63308059fdb7e1de34a11 100644
--- a/src/full-codegen/full-codegen.cc
+++ b/src/full-codegen/full-codegen.cc
@@ -984,6 +984,13 @@ void FullCodeGenerator::EmitBreak(Statement* target) {
   __ 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);