Add 122-npe to knownfailures on debuggable jit-on-first-use

The test fails due to `Unexpected vreg location Kind<-1>` for unknown
reasons.

Test: ./test/testrunner/testrunner.py --host \
                                      --jit --jit-on-first-use \
                                      --debuggable --ndebuggable \
                                      -t 122
Bug: 136021898
Change-Id: I52e14d800767885543ebd026e0c77b53a098f8f1
1 file changed