tst_qlogging: Skip backtrace tests under ASan

ASan inserts a lot of function calls in between our calls, so they end
up in the backtrace and cause unexpected results.

Similar to c672f148db.

Fixes: QTBUG-109559
Pick-to: 6.4 6.5
Change-Id: I69ecc04064514f939896fffd1732dd2bc0317ae4
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

tests/auto/corelib/global/qlogging/tst_qlogging.cpp

@@ -725,6 +725,8 @@ void tst_qmessagehandler::qMessagePattern_data()
 #ifdef __GLIBC__
 #  if QT_CONFIG(static)
     // These test cases don't work with static Qt builds
+#  elif defined(QT_ASAN_ENABLED)
+    // These tests produce far more call frames under ASan
 #  else
 #    ifndef QT_NO_DEBUG
     QList<QByteArray> expectedBacktrace = {