Use a custom Struct for stack trace storage

src/messages.h

Index: src/messages.h
diff --git a/src/messages.h b/src/messages.h
index 32ba8b1df3ce3b9f9d3a8d4ded86372e7dad5197..a2a405accac803e4c2d6f7b3ee0090fef8909c2c 100644
--- a/src/messages.h
+++ b/src/messages.h
@@ -42,40 +42,6 @@ class MessageLocation {
   Handle<JSFunction> function_;
 };
 
-
-class CallSite {
- public:
-  CallSite(Isolate* isolate, Handle<JSObject> call_site_obj);
-
-  Handle<Object> GetFileName();
-  Handle<Object> GetFunctionName();
-  Handle<Object> GetScriptNameOrSourceUrl();
-  Handle<Object> GetMethodName();
-  Handle<Object> GetTypeName();
-  Handle<Object> GetEvalOrigin();
-  // Return 1-based line number, including line offset.
-  int GetLineNumber();
-  // Return 1-based column number, including column offset if first line.
-  int GetColumnNumber();
-  bool IsNative();
-  bool IsToplevel();
-  bool IsEval();
-  bool IsConstructor();
-
-  bool IsJavaScript() { return !fun_.is_null(); }
-  bool IsWasm() { return !wasm_obj_.is_null(); }
-
-  int wasm_func_index() const { return wasm_func_index_; }
-
- private:
-  Isolate* isolate_;
-  Handle<Object> receiver_;
-  Handle<JSFunction> fun_;
-  int32_t pos_ = -1;
-  Handle<JSObject> wasm_obj_;
-  uint32_t wasm_func_index_ = static_cast<uint32_t>(-1);
-};
-
 // Determines how stack trace collection skips frames.
 enum FrameSkipMode {
   // Unconditionally skips the first frame. Used e.g. when the Error constructor
@@ -107,16 +73,6 @@ class ErrorUtils : public AllStatic {
                                               Handle<Object> stack_trace);
 };
 
-class CallSiteUtils : public AllStatic {
- public:
-  static MaybeHandle<Object> Construct(Isolate* isolate,
-                                       Handle<Object> receiver,
-                                       Handle<Object> fun, Handle<Object> pos,
-                                       Handle<Object> strict_mode);
-
-  static MaybeHandle<String> ToString(Isolate* isolate, Handle<Object> recv);
-};
-
 #define MESSAGE_TEMPLATES(T)                                                   \
   /* Error */                                                                  \
   T(None, "")                                                                  \