[llvm] [RISCV] Fix bugs about getting register list of Zcmp push/pop. (PR #66073)

[Kito Cheng via llvm-commits]

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@@ -228,35 +228,36 @@ getRestoreLibCallName(const MachineFunction &MF,
 
 // Return encoded value for PUSH/POP instruction, representing
 // registers to store/load.
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kito-cheng wrote:

Comment need to update to reflect the update.

https://github.com/llvm/llvm-project/pull/66073