add valgrind support to underscore_test

underscore_test

@@ -1,8 +1,22 @@
 #!/bin/sh
 
+if [ "$1" = "valgrind" ]; then
+	VALGRIND=1
+	CMD=$2
+	TEST=$3
+else
+	VALGRIND=0
+	CMD=$1
+	TEST=$2
+fi
+
 cat underscore-test-shim.js \
     underscore/underscore.js \
-    $2 \
+    $TEST \
     > /tmp/duk-underscore-test.js
 
-$1 /tmp/duk-underscore-test.js
+if [ x"$VALGRIND" = "x1" ]; then
+	valgrind $CMD /tmp/duk-underscore-test.js
+else
+	$CMD /tmp/duk-underscore-test.js
+fi