[riscv-port] RFR: 8276988: riscv: Fix a register name string: lr to x5

[Fei Yang]

On Thu, 11 Nov 2021 09:25:24 GMT, zhengxiaolinX <duke at openjdk.java.net> wrote:

> Hi team -
> 
> Simply fix a register name string: `lr` is `names[1]` so `names[5]` should be `x5`.
> 
> Thanks,
> Xiaolin

Looks good. I suggest typo fixes like this be combined into other non-trivial PRs in future.

-------------

Marked as reviewed by fyang (Committer).

PR: https://git.openjdk.java.net/riscv-port/pull/2