perf-test: add notmuch-memory-test

Somehow this file was not added to the patch set which split the tests
into time and memory tests. Take advantage of the the "new" way of
running tests to avoid listing the explicitly.

performance-test/notmuch-memory-test

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+# Run tests
+#
+# Copyright (c) 2005 Junio C Hamano
+#
+# Adapted from a Makefile to a shell script by Carl Worth (2010)
+
+if [ ${BASH_VERSINFO[0]} -lt 4 ]; then
+    echo "Error: The notmuch test suite requires a bash version >= 4.0"
+    echo "due to use of associative arrays within the test suite."
+    echo "Please try again with a newer bash (or help us fix the"
+    echo "test suite to be more portable). Thanks."
+    exit 1
+fi
+
+cd $(dirname "$0")
+
+for test in M*.sh; do
+    ./"$test" "$@"
+done