[debugger] muting break positions should work for the entire statement.

src/debug/debug.h

Index: src/debug/debug.h
diff --git a/src/debug/debug.h b/src/debug/debug.h
index 65a21a706bf6d62112d867062ea752f08f918fb2..3381282a8d290a1637091c60f1a7d68e850ff683 100644
--- a/src/debug/debug.h
+++ b/src/debug/debug.h
@@ -76,6 +76,10 @@ class BreakLocation {
   static void FromAddressSameStatement(Handle<DebugInfo> debug_info, Address pc,
                                        List<BreakLocation>* result_out);
 
+  static void AllForStatementPosition(Handle<DebugInfo> debug_info,
+                                      int statement_position,
+                                      List<BreakLocation>* result_out);
+
   static BreakLocation FromPosition(Handle<DebugInfo> debug_info, int position,
                                     BreakPositionAlignment alignment);