[debugger, interpreter] add break location at if-statement.

src/interpreter/bytecode-generator.cc

 // Copyright 2015 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/interpreter/bytecode-generator.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler.h"
 #include "src/interpreter/bytecode-register-allocator.h"
 #include "src/interpreter/control-flow-builders.h"
@@ skipping 815 matching lines @@
   builder()->SetStatementPosition(stmt);
   VisitForEffect(stmt->expression());
 }
 
 
 void BytecodeGenerator::VisitEmptyStatement(EmptyStatement* stmt) {
 }
 
 
 void BytecodeGenerator::VisitIfStatement(IfStatement* stmt) {
+  builder()->SetStatementPosition(stmt);
   BytecodeLabel else_label, end_label;
   if (stmt->condition()->ToBooleanIsTrue()) {
     // Generate then block unconditionally as always true.
     Visit(stmt->then_statement());
   } else if (stmt->condition()->ToBooleanIsFalse()) {
     // Generate else block unconditionally if it exists.
     if (stmt->HasElseStatement()) {
       Visit(stmt->else_statement());
     }
   } else {
@@ skipping 2292 matching lines @@
 }
 
 
 int BytecodeGenerator::feedback_index(FeedbackVectorSlot slot) const {
   return info()->feedback_vector()->GetIndex(slot);
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8