Set jitthreshold to 0 with --jvmti

This is a speculative revert of the CL that changed the jitthreshold to
1 to see if this fixes time outs on jvmti related tests on ASAN. The
timeouts started with the CL that changed the threshold and the dump
shows exactly two threads one of which is a jit thread. So this is the
potential culprit.

Bug: 238730394
Test: art/test.py
Change-Id: I31c690cbe963d33d06be06fc19f43f70107bcfa8
1 file changed