Disable asan for now.

#981

.buildbot.sh

@@ -96,9 +96,10 @@ done
 
 # Test with LLVM sanitisers
 rustup component add rust-src
-RUSTFLAGS="-Z sanitizer=address" cargo test \
-    -Z build-std \
-    --target x86_64-unknown-linux-gnu
+# FIXME: asan disabled for now: https://github.com/ykjit/yk/issues/981
+#RUSTFLAGS="-Z sanitizer=address" cargo test \
+#    -Z build-std \
+#    --target x86_64-unknown-linux-gnu
 # The thread sanitiser does have false positives (albeit much reduced by `-Z
 # build-std`), so we have to add a suppression file to avoid those stopping
 # this script from succeeding. This does mean that we might suppress some true