Revert "Update run-test script to pass --Xjitthreshold:0 for jvmti tests"

This reverts commit 0bc369b6a7c6d380876574f5b1f7fe3aa78839fb.

Reason for revert: Breaks some ART run-tests.

Change-Id: I32004a205b3ee8c0723d1efeb5e1d7b12a7e19af
Test: testrunner.py --host --debug --cdex-fast --jit --redefine-stress --debuggable
diff --git a/test/etc/run-test-jar b/test/etc/run-test-jar
index cc22e6e..9d7dc7e 100755
--- a/test/etc/run-test-jar
+++ b/test/etc/run-test-jar
@@ -644,12 +644,6 @@
     # We used to add flags here that made the runtime debuggable but that is not
     # needed anymore since the plugin can do it for us now.
     FLAGS="${FLAGS} -Xplugin:${plugin}"
-
-    # For jvmti tests, set the threshold of compilation to 0, so we jit on the first
-    # use to provide better test coverage for jvmti + jit. This means we won't run
-    # the default --jit configuration but it is not too important test scenario for
-    # jvmti tests. This is art specific flag, so don't use it with jvm.
-    FLAGS="${FLAGS} -Xjitthreshold:0"
   fi
 fi