i965: Move compression decisions before brw_reg_from_fs_reg().
i965: Move compression decisions before brw_reg_from_fs_reg().

brw_reg_from_fs_reg() needs to know whether the instruction will be
compressed or not.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=95370
Signed-off-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>
Reviewed-by: Matt Turner <789b315743a28dd066a4ba1459c35951c291d8a6@gmail.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler