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

Change-Id: I0addb26d22d3e7d486b40119ad35639dd15b9d53
diff --git a/test/run-test b/test/run-test
index 795c521..9095dd3 100755
--- a/test/run-test
+++ b/test/run-test
@@ -85,6 +85,9 @@
     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
@@ -167,6 +170,7 @@
         echo "    --debug        Wait for a debugger to attach."
         #echo "    --gdb          Run under gdb; incompatible with some tests."
         echo "    --build-only   Build test files only (off by default)."
+        echo "    --interpreter  Enable interpreter only mode (off by default)."
         echo "    --no-verify    Turn off verification (on by default)."
         echo "    --no-optimize  Turn off optimization (on by default)."
         echo "    --no-precise   Turn off precise GC (on by default)."