[Bug 295823] lib/libc/string/strrchr2_test:values test failing in CI due to bug in riscv strrchr.S

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295823

            Bug ID: 295823
           Summary: lib/libc/string/strrchr2_test:values test failing in
                    CI due to bug in riscv strrchr.S
           Product: Base System
           Version: 16.0-CURRENT
          Hardware: riscv
               URL: https://ci.freebsd.org/job/FreeBSD-main-riscv64-test/1
                    6612/testReport/lib.libc.string/strrchr2_test/values/
                OS: Any
            Status: New
          Keywords: regression
          Severity: Affects Only Me
          Priority: ---
         Component: tests
          Assignee: fuz@FreeBSD.org
          Reporter: siva@FreeBSD.org
                CC: riscv@FreeBSD.org, standards@FreeBSD.org,
                    testing@FreeBSD.org

Created attachment 271451
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=271451&action=edit
CI test report

The 'lib.libc.string/strrchr2_test/values' testcase is currently failing in CI
on riscv64 (URL and report attached in this bug).

This is locally reproducible with Bricoler with this command:

bricoler freebsd-regression-test-suite --freebsd-src-git-checkout/url=/usr/src
--freebsd-src-git-checkout/branch= --freebsd-regression-test-suite/memory=3072
--freebsd-regression-test-suite/ncpus=2
--freebsd-regression-test-suite/parallelism=1
--freebsd-src-build/machine=riscv/riscv64
--freebsd-regression-test-suite/hypervisor=qemu --freebsd-vm-image/packages=
--freebsd-regression-test-suite/tests='lib/libc/string/strrchr2_test:values'

fuz@, if I remove strrchr.S from MDSRCS in lib/libc/riscv/string/Makefile.inc,
the test passes. This points to a bug in lib/libc/riscv/string/strrchr.S.
Please triage as necessary.

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