exec_list: add a list_foreach_typed_reverse() macro
exec_list: add a list_foreach_typed_reverse() macro

Reviewed-by: Eric Anholt <96f164ad4d9b2b0dacf8ebee2bb1eeb3aa69adf1@anholt.net>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler