intel/brw: Hide register pressure information in dumps

It was the default to show register pressure for each instruction,
but it gets in the way of cleaner diffs before/after an optimization pass.
Add INTEL_DEBUG=reg-pressure option to show it again.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29114>

src/intel/dev/intel_debug.c

@@ -105,6 +105,7 @@ static const struct debug_control debug_control[] = {
    { "sparse",      DEBUG_SPARSE },
    { "draw_bkp",    DEBUG_DRAW_BKP },
    { "bat-stats",   DEBUG_BATCH_STATS },
+   { "reg-pressure", DEBUG_REG_PRESSURE },
    { NULL,    0 }
 };
 

src/intel/dev/intel_debug.h

@@ -96,6 +96,7 @@ extern uint64_t intel_debug;
 #define DEBUG_SPARSE              (1ull << 48)
 #define DEBUG_DRAW_BKP            (1ull << 49)
 #define DEBUG_BATCH_STATS         (1ull << 50)
+#define DEBUG_REG_PRESSURE        (1ull << 51)
 
 #define DEBUG_ANY                 (~0ull)