[llvm] [RISCV] Add a test for multiple save locations of a callee-saved register (PR #164479)

[Sam Elliott via llvm-commits]

lenary wrote:

> I believe this test is causing test errors because it generates a .s file with no RUN lines causing problems when trying to run tests: https://lab.llvm.org/buildbot/#/builders/202/builds/4244
> 
> ```
> ******************** TEST 'LLVM :: CodeGen/RISCV/cfi-multiple-locations.s' FAILED ********************
> Test has no 'RUN:' line
> ********************
> ```
> 
> Other tests that I can see using llc write the output to stdout and then pipe it to FileCheck, neither of which this test does. If you do not care about the actual output file, can we maybe send the output to `/dev/null` or something similar instead to avoid this problem?

It's hard to solve this immediately, as evidently you're not cleaning up the source directory before builds. This test should no longer be being run at all, but evidently the `.s` from when it was being run has stuck around in your source directory.

https://github.com/llvm/llvm-project/pull/164479