[debug] Refactored function param to be const ref

Bug: v8:8015
Change-Id: I3a3bd587e1f126b533a1eaea1ff9f74c2d0102b0
Reviewed-on: https://chromium-review.googlesource.com/1209847Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Florian Sattler <sattlerf@google.com>
Cr-Commit-Position: refs/heads/master@{#55753}

src/debug/debug.cc

@@ -1543,7 +1543,7 @@ void Debug::FindDebugInfo(Handle<DebugInfo> debug_info,
   UNREACHABLE();
 }
 
-void Debug::ClearAllDebugInfos(DebugInfoClearFunction clear_function) {
+void Debug::ClearAllDebugInfos(const DebugInfoClearFunction& clear_function) {
   DebugInfoListNode* prev = nullptr;
   DebugInfoListNode* current = debug_info_list_;
   while (current != nullptr) {

src/debug/debug.h

@@ -451,7 +451,7 @@ class Debug {
 
   // Wraps logic for clearing and maybe freeing all debug infos.
   typedef std::function<void(Handle<DebugInfo>)> DebugInfoClearFunction;
-  void ClearAllDebugInfos(DebugInfoClearFunction clear_function);
+  void ClearAllDebugInfos(const DebugInfoClearFunction& clear_function);
 
   void FindDebugInfo(Handle<DebugInfo> debug_info, DebugInfoListNode** prev,
                      DebugInfoListNode** curr);