Add -interpreter to run-test to test interpreter only mode.

Change-Id: I0addb26d22d3e7d486b40119ad35639dd15b9d53
diff --git a/test/run-all-tests b/test/run-all-tests
index 3176f02..a6675df 100755
--- a/test/run-all-tests
+++ b/test/run-all-tests
@@ -49,6 +49,9 @@
     elif [ "x$1" = "x--zygote" ]; then
         run_args="${run_args} --zygote"
         shift
+    elif [ "x$1" = "x--interpreter" ]; then
+        run_args="${run_args} --interpreter"
+        shift
     elif [ "x$1" = "x--no-verify" ]; then
         run_args="${run_args} --no-verify"
         shift
@@ -84,8 +87,8 @@
         echo "  $prog [options]  Run all tests with the given options."
         echo "  Options are all passed to run-test; refer to that for " \
              "further documentation:"
-        echo "    --debug --dev --host --jvm --no-optimize --no-verify"
-        echo "    -O --update --valgrind --zygote"
+        echo "    --debug --dev --host --interpreter --jvm --no-optimize"
+        echo "    --no-verify -O --update --valgrind --zygote"
     ) 1>&2
     exit 1
 fi