[llvm] [BOLT][RISCV] Precommit test for a call that links through t0 (PR #218396)

[Kito Cheng via llvm-commits]

kito-cheng wrote:

@rafaelauler this PR is only adding testcase without change code on bolt, the actual fix is #218408, my intention is to make it easier to observe the differences in the diff during follow up PR (#218408), I guess next time I will add `[NFC]` to prevent confusion :)

https://github.com/llvm/llvm-project/pull/218396