Revert "st_glsl_to_tgsi: rewrite rename registers to use array fully."

Revert "st_glsl_to_tgsi: rewrite rename registers to use array fully."

This reverts commit 3008161d28e38336ba39aba4769a2deaf9732f55,
which caused a regression for VMWare.

The initial code had some recursion in it, that I removed by accident
trying to add back the recursion broke lots of things, take the high
road and revert for now.

Fixes: 3008161d (st_glsl_to_tgsi: rewrite rename registers to use array fully.)
Reviewed-by: Brian Paul <brianp@vmware.com>
Tested-by: Brian Paul <brianp@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>