Revert "drop old INTEL_DEBUG names for perf (fall) and fs (wm)"

This reverts commit 195994fe4c.

It wasn't sent to the list, Ken didn't review it, and it breaks
shader-db.

src/mesa/drivers/dri/i965/intel_debug.c

@@ -40,6 +40,7 @@ static const struct dri_debug_control debug_control[] = {
    { "state", DEBUG_STATE},
    { "blit",  DEBUG_BLIT},
    { "mip",   DEBUG_MIPTREE},
+   { "fall",  DEBUG_PERF},
    { "perf",  DEBUG_PERF},
    { "perfmon", DEBUG_PERFMON},
    { "bat",   DEBUG_BATCH},
@@ -55,6 +56,7 @@ static const struct dri_debug_control debug_control[] = {
    { "dri",   DEBUG_DRI },
    { "sf",    DEBUG_SF },
    { "stats", DEBUG_STATS },
+   { "wm",    DEBUG_WM },
    { "urb",   DEBUG_URB },
    { "vs",    DEBUG_VS },
    { "clip",  DEBUG_CLIP },