i965: Skip IR annotations with INTEL_DEBUG=noann.

Running shader-db with INTEL_DEBUG=noann reduces the runtime
from ~90 to ~80 seconds on my machine. It also reduces the disk space
consumed by the .out files from 660 MB (676 on disk) to 343 MB (358 on
disk).

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/drivers/dri/i965/brw_shader.cpp

@@ -794,8 +794,10 @@ void annotate(struct brw_context *brw,
 
    struct annotation *ann = &annotation->ann[annotation->ann_count++];
    ann->offset = offset;
+   if ((INTEL_DEBUG & DEBUG_NO_ANNOTATION) == 0) {
       ann->ir = inst->ir;
       ann->annotation = inst->annotation;
+   }
 
    if (cfg->blocks[annotation->cur_block]->start == inst) {
       ann->block_start = cfg->blocks[annotation->cur_block];

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

@@ -65,6 +65,7 @@ static const struct dri_debug_control debug_control[] = {
    { "blorp", DEBUG_BLORP },
    { "nodualobj", DEBUG_NO_DUAL_OBJECT_GS },
    { "optimizer", DEBUG_OPTIMIZER },
+   { "noann", DEBUG_NO_ANNOTATION },
    { NULL,    0 }
 };
 

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

@@ -61,6 +61,7 @@ extern uint64_t INTEL_DEBUG;
 #define DEBUG_VUE         0x40000000
 #define DEBUG_NO_DUAL_OBJECT_GS 0x80000000
 #define DEBUG_OPTIMIZER   0x100000000
+#define DEBUG_NO_ANNOTATION 0x200000000
 
 #ifdef HAVE_ANDROID_PLATFORM
 #define LOG_TAG "INTEL-MESA"