[debug] change coverage API to use offset instead of line/column.

test/cctest/test-debug.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 6632 matching lines @@
   v8::debug::Coverage::ScriptData script_data = coverage.GetScriptData(0);
   v8::Local<v8::debug::Script> script = script_data.GetScript();
   CHECK(script->Source()
             .ToLocalChecked()
             ->Equals(env.local(), source)
             .FromMaybe(false));
 
   CHECK_EQ(2u, script_data.FunctionCount());
   v8::debug::Coverage::FunctionData function_data =
       script_data.GetFunctionData(0);
-  CHECK_EQ(0, function_data.Start().GetLineNumber());
-  CHECK_EQ(0, function_data.Start().GetColumnNumber());
-  CHECK_EQ(3, function_data.End().GetLineNumber());
-  CHECK_EQ(4, function_data.End().GetColumnNumber());
+  v8::debug::Location start =
+      script->GetSourceLocation(function_data.StartOffset());
+  v8::debug::Location end =
+      script->GetSourceLocation(function_data.EndOffset());
+  CHECK_EQ(0, start.GetLineNumber());
+  CHECK_EQ(0, start.GetColumnNumber());
+  CHECK_EQ(3, end.GetLineNumber());
+  CHECK_EQ(4, end.GetColumnNumber());
   CHECK_EQ(1, function_data.Count());
 
   function_data = script_data.GetFunctionData(1);
-  CHECK_EQ(0, function_data.Start().GetLineNumber());
-  CHECK_EQ(0, function_data.Start().GetColumnNumber());
-  CHECK_EQ(1, function_data.End().GetLineNumber());
-  CHECK_EQ(1, function_data.End().GetColumnNumber());
+  start = script->GetSourceLocation(function_data.StartOffset());
+  end = script->GetSourceLocation(function_data.EndOffset());
+  CHECK_EQ(0, start.GetLineNumber());
+  CHECK_EQ(0, start.GetColumnNumber());
+  CHECK_EQ(1, end.GetLineNumber());
+  CHECK_EQ(1, end.GetColumnNumber());
   CHECK_EQ(2, function_data.Count());
 }