Update expectations on failing asan tests

src/test/run_known_gcc_test_failures.txt

@@ -197,7 +197,6 @@ pr23135.c.o.wasm O0
 loop-2g.c.o.wasm
 loop-2f.c.o.wasm
 
-ubsan__return-1.C.o.wasm
 abi__bitfield1.C.o.wasm
 abi__vbase13.C.o.wasm
 eh__alias1.C.o.wasm
@@ -273,3 +272,10 @@ torture__stackalign__throw-1.C.o.wasm
 torture__stackalign__throw-2.C.o.wasm
 torture__stackalign__throw-3.C.o.wasm
 tree-ssa__pr33604.C.o.wasm
+
+### Sanitizer tests
+# Because we don't run sanitizers on them, they may succeed or fail, and we
+# should not care about the results. For now we list tests that happen to fail.
+asan__deep-stack-uaf-1.C.o.wasm
+asan__symbolize-callback-1.C.o.wasm
+ubsan__return-1.C.o.wasm