The expected references are generated using a here-doc with some inline
command substitutions. If one of the `git rev-parse` invocations within
the command substitutions fails, its return code is swallowed and we
won't know about it. Replace these command substitutions with
generate_references(), which actually reports when `git rev-parse`
fails.

Signed-off-by: Denton Liu <redacted>
---

diff --git a/t/t5512-ls-remote.sh b/t/t5512-ls-remote.sh

@@ -212,17 +217,18 @@ test_expect_success 'protocol v2 supports hiderefs' '
 test_expect_success 'ls-remote --symref' '
+       echo "$oid      refs/remotes/origin/HEAD" >>expect &&
+       generate_references \
+       refs/remotes/origin/master \
+               refs/tags/mark \
+               refs/tags/mark1.1 \
+               refs/tags/mark1.10 \
+               refs/tags/mark1.2 >>expect &&