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/run-test b/test/run-test
index 1b6df16..044f63f 100755
--- a/test/run-test
+++ b/test/run-test
@@ -144,6 +144,7 @@
 gc_verify="false"
 gc_stress="false"
 jvmti_trace_stress="false"
+jvmti_field_stress="false"
 jvmti_redefine_stress="false"
 strace="false"
 always_clean="no"
@@ -244,6 +245,9 @@
     elif [ "x$1" = "x--jvmti-redefine-stress" ]; then
         jvmti_redefine_stress="true"
         shift
+    elif [ "x$1" = "x--jvmti-field-stress" ]; then
+        jvmti_field_stress="true"
+        shift
     elif [ "x$1" = "x--jvmti-trace-stress" ]; then
         jvmti_trace_stress="true"
         shift
@@ -460,6 +464,9 @@
 if [ "$jvmti_redefine_stress" = "true" ]; then
     run_args="${run_args} --no-app-image --jvmti-redefine-stress"
 fi
+if [ "$jvmti_field_stress" = "true" ]; then
+    run_args="${run_args} --no-app-image --jvmti-field-stress"
+fi
 if [ "$jvmti_trace_stress" = "true" ]; then
     run_args="${run_args} --no-app-image --jvmti-trace-stress"
 fi