lto-wrapper.cc: Delete offload_names temp files in case of error [PR106686]

lto-wrapper.cc: Delete offload_names temp files in case of error [PR106686]

Usually, the caller takes care of the .o files for the offload compilers
(suffix: ".target.o"). However, if an error occurs during processing
(e.g. fatal error by lto1), they were not deleted.

gcc/ChangeLog:

	PR lto/106686
	* lto-wrapper.cc (free_array_of_ptrs): Move before tool_cleanup.
	(tool_cleanup): Unlink offload_names.
	(compile_offload_image): Take filename argument to set it early.
	(compile_images_for_offload_targets): Update call; set
	offload_names to NULL after freeing the array.