Add test configs for mimalloc (#26508)

Adds two test configs that run the test suite with mimalloc

To be merged after #26246

[Reviewed by @jhh67]

Author: jabraham17

util/cron/test-mimalloc.bash

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+#
+# Test with mimalloc allocator
+
+UTIL_CRON_DIR=$(cd $(dirname ${BASH_SOURCE[0]}) ; pwd)
+source $UTIL_CRON_DIR/common.bash
+source $UTIL_CRON_DIR/common-localnode-paratest.bash
+
+export CHPL_HOST_MEM=mimalloc
+export CHPL_TARGET_MEM=mimalloc
+
+export CHPL_NIGHTLY_TEST_CONFIG_NAME="mimalloc"
+
+$UTIL_CRON_DIR/nightly -cron ${nightly_args} $(get_nightly_paratest_args 2)

util/cron/test-ml-mimalloc.bash

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+#
+# Test with mimalloc allocator, multilocale tests only
+
+UTIL_CRON_DIR=$(cd $(dirname ${BASH_SOURCE[0]}) ; pwd)
+source $UTIL_CRON_DIR/common-gasnet.bash
+source $UTIL_CRON_DIR/common-localnode-paratest.bash
+unset CHPL_LAUNCHER
+
+export GASNET_QUIET=Y
+
+export CHPL_HOST_MEM=mimalloc
+export CHPL_TARGET_MEM=mimalloc
+
+export CHPL_NIGHTLY_TEST_CONFIG_NAME="ml-mimalloc"
+
+$UTIL_CRON_DIR/nightly -cron -multilocale ${nightly_args} $(get_nightly_paratest_args 2)