[llvm] [RISCV] Sink hasSideEffects, mayLoad, mayStore from defs to classes in RISCVInstrInfo.td. NFC (PR #130714)

[Sam Elliott via llvm-commits]

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@@ -70,6 +71,7 @@ let Predicates = [HasVendorXCVbitmanip, IsRV32],
   def CV_CNT : CVBitManipR<0b0100100, "cv.cnt">;
 }
 
+let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
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lenary wrote:

This can go inside CVInstMac right, rather than with a let?

https://github.com/llvm/llvm-project/pull/130714