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

src/interpreter/bytecode-generator.cc

Index: src/interpreter/bytecode-generator.cc
diff --git a/src/interpreter/bytecode-generator.cc b/src/interpreter/bytecode-generator.cc
index 5aa739ff457515075514020bebae08035c7c8586..0b8490e8a1aabff7eec1425d9ab30f5b3e5acc68 100644
--- a/src/interpreter/bytecode-generator.cc
+++ b/src/interpreter/bytecode-generator.cc
@@ -833,6 +833,7 @@ 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.