Allow BackgroundCompileTask to be created from a background thead

This will be useful for implementing crbug.com/1328448.

Bug: v8:12916
Change-Id: Id22ae96f6c1f9b72ab09508dd1f6dc2d70f8b5d4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3677654
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80863}

src/api/api.cc

@@ -2715,7 +2715,6 @@ ScriptCompiler::ScriptStreamingTask* ScriptCompiler::StartStreaming(
                   "Invalid CompileOptions");
   if (!i::FLAG_script_streaming) return nullptr;
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
-  DCHECK_NO_SCRIPT_NO_EXCEPTION(i_isolate);
   i::ScriptStreamingData* data = source->impl();
   std::unique_ptr<i::BackgroundCompileTask> task =
       std::make_unique<i::BackgroundCompileTask>(data, i_isolate, type,

src/codegen/compiler.cc

@@ -1545,12 +1545,7 @@ BackgroundCompileTask::BackgroundCompileTask(
       timer_(isolate->counters()->compile_script_on_background()),
       start_position_(0),
       end_position_(0),
-      function_literal_id_(kFunctionLiteralIdTopLevel) {
-  VMState<PARSER> state(isolate);
-
-  LOG(isolate, ScriptEvent(V8FileLogger::ScriptEventType::kStreamingCompile,
-                           flags_.script_id()));
-}
+      function_literal_id_(kFunctionLiteralIdTopLevel) {}
 
 BackgroundCompileTask::BackgroundCompileTask(
     Isolate* isolate, Handle<SharedFunctionInfo> shared_info,