RFR: 8320399: RISC-V: Some format clean-up in opto assembly code

[Fei Yang]

On Mon, 20 Nov 2023 11:38:09 GMT, Feilong Jiang <fjiang at openjdk.org> wrote:

> Hi, please review this trivial clean-up in riscv.ad and c2_macroAssembler_riscv.cpp:
> - Some C2 instructions are missing the `done` label at the end of the format string. 
> - Fix format naming error in `MoveF2I_reg_reg` and `MoveL2D_reg_reg`.
> - Small code adjustments to `C2_MacroAssembler::string_compare`.
> 
> Testing:
> - [x] GHA linux-riscv cross-compiling

Marked as reviewed by fyang (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/16734#pullrequestreview-1739963211