lto-wrapper.c (run_gcc): In non-parallel mode remove ltrans inputs immediately after processing them.

2011-12-15  Richard Guenther  <rguenther@suse.de>

	* lto-wrapper.c (run_gcc): In non-parallel mode remove
	ltrans inputs immediately after processing them.  In parallel
	mode truncate the ltrans inputs in the make rule that processes
	them if temporary files are not to be preserved.

From-SVN: r182370