Revert "Temporarily disable TSAN"

This reverts commit 4152680.

Author: finestructure

Makefile

@@ -33,16 +33,10 @@ build:
 run:
 	swift run
 
-# sas 2024-09-07: temporarily disable TSAN, it's triggering on Linux again (not on macOS).
-# Probably related to the Swift 6 nightly image we're currently using.
 test: xcbeautify
 	set -o pipefail \
-	&& swift test --disable-automatic-resolution \
+	&& swift test --disable-automatic-resolution --sanitize=thread \
 	2>&1 | ./xcbeautify --renderer github-actions
-#test: xcbeautify
-#	set -o pipefail \
-#	&& swift test --disable-automatic-resolution --sanitize=thread \
-#	2>&1 | ./xcbeautify --renderer github-actions
 
 test-query-performance: xcbeautify
 	set -o pipefail \