* emit-rtl.c (unshare_all_rtl): Unshare virtual parameters too.

* emit-rtl.c (unshare_all_rtl): Unshare virtual parameters too.
Use unshare_all_rtl_1.
(unshare_all_rtl_again): New function.
(unshare_all_rtl_1): New function split out of unshare_all_rtl.

* function.c (purge_addressof_1): Use unshare_all_rtl_again
rather than resetting the 'used' flags ourself.

* toplev.c (rest_of_compilation): Add current_function_decl
to the unshare_all_rtl call.
* tree.h: Prototype unshare_all_rtl.
* rtl.h: Prototype unshare_all_rtl_again here.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@31651 138bc75d-0d04-0410-961f-82ee72b054a4