st/glsl_to_tgsi: sort input and output decls by TGSI index
st/glsl_to_tgsi: sort input and output decls by TGSI index

Fixes a regression introduced by commit 777dcf81b.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98307
Reviewed-by: Marek Olšák <8c7344a1abdb103e79ecfd488098373070c3c70e@amd.com>
Cc: 13.0 <59f39c0db42d4479a46b02d4d2bc11120e37bb44@lists.freedesktop.org>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler