Disable perf counters for now

run-ci

@@ -13,7 +13,7 @@
 #   COLLECT_RTS_STATS
 #                  collect runtime system statistics from compiler (forced on)
 #   COLLECT_PERF_STATS
-#                  collect perf_events counters from compiler (forced on)
+#                  collect perf_events counters from compiler
 #   GHC_PERF_STATS_EVENTS
 #                  which counters to collect
 #
@@ -87,7 +87,6 @@ if [ -n "$COLLECT_RTS_STATS" ]; then
 fi
 
 # Collect perf stats from compilation.
-COLLECT_PERF_STATS=1
 if [ -n "$COLLECT_PERF_STATS" ]; then
   use_wrapper=1
   export GHC_PERF_STATS_DIR="$OUT_DIR/perf-stats"