[cleanup] remove unused variable in `GetSharedFunctionInfoForScript`

Change-Id: If33624193cb771ec0f1d7fc3364d50c850af7dcb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2822276Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73950}

src/codegen/compiler.cc

@@ -2883,7 +2883,6 @@ MaybeHandle<SharedFunctionInfo> Compiler::GetSharedFunctionInfoForScript(
         is_compiled_scope = inner_result->is_compiled_scope(isolate);
         DCHECK(is_compiled_scope.is_compiled());
         compilation_cache->PutScript(source, language_mode, inner_result);
-        Handle<Script> script(Script::cast(inner_result->script()), isolate);
         maybe_result = inner_result;
       } else {
         // Deserializer failed. Fall through to compile.