Fix native compiler string hash consing strategy (bug#47868)

Fix native compiler string hash consing strategy (bug#47868)

	* test/src/comp-tests.el (comp-test-47868-1): Add new test.
	* test/src/comp-test-funcs.el (comp-test-47868-1-f)
	(comp-test-47868-2-f): New functions.
	* lisp/emacs-lisp/comp.el (comp-imm-equal-test): Define new hash
	tanble test.
	(comp-data-container): Use it.
	(comp-final, comp-run-async-workers): have comp required before
	reading dumped hashes so that `comp-imm-equal-test' is defined.