winsys/radeon: better explain the num_tile_pipes fixup for TAHITI (v2)
winsys/radeon: better explain the num_tile_pipes fixup for TAHITI (v2)

v2: Clarify the relation between num_tiles_pipes and GB_TILE_MODE and the fix
 needed for Tahiti as suggested by Marek.

Signed-off-by: Alexandre Demers <155ff836d06bca82eb14822dc602e268823b4a5f@gmail.com>
Signed-off-by: Marek Olšák <8c7344a1abdb103e79ecfd488098373070c3c70e@amd.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler