[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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@@ -89,6 +91,7 @@ class CVInstMacMulN<bits<2> funct2, bits<3> funct3, dag outs, dag ins,
   let DecoderNamespace = "XCV";
 }
 
+let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in {
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lenary wrote:

These can, I think, go inside `CVInstMacMulN`

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