LTO-wrapper, don't pre-link early debug objects.

LTO-wrapper, don't pre-link early debug objects.

Pass them to the final link, the pre-link wasn't effective.
Make the temp filenames easier to follow.
Also save them in the CWD when save-temps is given.

2018-12-23  Iain Sandoe  <iain@sandoe.co.uk>

	* lto-wrapper.c (tool_cleanup): Don’t report ficticious temp files.
	(debug_objcopy): Improve temp filenames.  Append the early
	debug objects to the outfiles.  Remove the phase prelinking the
	early debug. Emit the early debug filenames for ld.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@267373 138bc75d-0d04-0410-961f-82ee72b054a4