Add field-access/modification to ti-stress.

These tests stress jvmti FieldAccess and FieldModification.

Test: ./test/testrunner/testrunner.py --host --field-stress -j40
Change-Id: Ie2ea91e165beed73f14e8aff0adb137becdccd01
diff --git a/test/etc/run-test-jar b/test/etc/run-test-jar
index 8aacc8c..c44fb97 100755
--- a/test/etc/run-test-jar
+++ b/test/etc/run-test-jar
@@ -63,6 +63,7 @@
 TEST_IS_NDEBUG="n"
 APP_IMAGE="y"
 JVMTI_STRESS="n"
+JVMTI_FIELD_STRESS="n"
 JVMTI_TRACE_STRESS="n"
 JVMTI_REDEFINE_STRESS="n"
 VDEX_FILTER=""
@@ -159,6 +160,10 @@
         JVMTI_STRESS="y"
         JVMTI_REDEFINE_STRESS="y"
         shift
+    elif [ "x$1" = "x--jvmti-field-stress" ]; then
+        JVMTI_STRESS="y"
+        JVMTI_FIELD_STRESS="y"
+        shift
     elif [ "x$1" = "x--jvmti-trace-stress" ]; then
         JVMTI_STRESS="y"
         JVMTI_TRACE_STRESS="y"
@@ -415,6 +420,9 @@
       agent_args="${agent_args},redefine,${DEXTER_BINARY},${file_1},${file_2}"
     fi
   fi
+  if [[ "$JVMTI_FIELD_STRESS" = "y" ]]; then
+    agent_args="${agent_args},field"
+  fi
   if [[ "$JVMTI_TRACE_STRESS" = "y" ]]; then
     agent_args="${agent_args},trace"
   fi