Kokoro: Build with ASAN enabled.

Try and catch memory corruption in our unit tests.

Change-Id: I5712c443de002ca563ba474cb77451d2791e7ec0
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/30169
Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
diff --git a/tests/kokoro/macos/continuous.sh b/tests/kokoro/macos/continuous.sh
index 9773c5a..288ce02 100755
--- a/tests/kokoro/macos/continuous.sh
+++ b/tests/kokoro/macos/continuous.sh
@@ -15,7 +15,7 @@
   REACTOR_BACKEND="LLVM"
 fi
 
-cmake .. "-DREACTOR_BACKEND=${REACTOR_BACKEND}"
+cmake .. "-DASAN=ON -DREACTOR_BACKEND=${REACTOR_BACKEND}"
 make -j$(sysctl -n hw.logicalcpu)
 
 # Run the reactor unit tests.