Add jit-on-first-use test configurations.

Test: run_build_test_target.py -j48 art-jit-on-first-use
Test: run_build_test_target.py -j48 art-jit-on-first-use-gcstress
Bug: 62611253
Change-Id: I83b84d0dd660198cc712f7d12c4e4f803a5283a0
diff --git a/test/testrunner/target_config.py b/test/testrunner/target_config.py
index b323ddc..95e488d 100644
--- a/test/testrunner/target_config.py
+++ b/test/testrunner/target_config.py
@@ -46,6 +46,10 @@
     'art-jit' : {
         'run-test' : ['--jit']
     },
+    'art-jit-on-first-use' : {
+        'run-test' : ['--jit',
+                      '--runtime-option=-Xjitthreshold:0']
+    },
     'art-pictest' : {
         'run-test' : ['--pictest',
                       '--optimizing']
@@ -66,6 +70,11 @@
         'run-test' : ['--jit',
                       '--gcstress']
     },
+    'art-jit-on-first-use-gcstress' : {
+        'run-test' : ['--jit',
+                      '--gcstress',
+                      '--runtime-option=-Xjitthreshold:0']
+    },
     # TODO: Rename or repurpose this configuration as
     # 'art-read-barrier-heap-poisoning' (b/62611253).
     'art-read-barrier' : {