Add ALLOW_RETRIES to flaky test dbg-record-roundtrip.ll (#85410)
Something strange is happening in this test.
If the llvm-as output is piped into llvm-link in the final RUN lines
then this test fails on my machine (1 in 200) using WSL2. If the
verify-uselistorder RUN lines are removed then it doesn't fail on my
machine (in 10,000+). If the llvm-as and llvm-link RUN lines mentioned
at the start are removed then it doesn't fail on my machine (in
10,000+).
Writing the llvm-as output to a temporary file for llvm-link to read on
those final RUN lines, the test doesn't fail on my machine (in 10,000+).
But it _does_ fail on a bot:
https://lab.llvm.org/buildbot/#/builders/245/builds/21930. So clearly my
workaround doesn't solve the underlying problem (and I have no idea what
that is).