[llvm] [RISCV] Remove vmv.s.x and vmv.x.s lmul pseudo variants (PR #71501)

[Wang Pengcheng via llvm-commits]

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@@ -7418,10 +7418,15 @@ foreach fvti = AllFloatVectors in {
                (fvti.Scalar fvti.ScalarRegClass:$rs2),
                GPR:$vl, fvti.Log2SEW)>;
 
+    defvar is_group = !isa<GroupVTypeInfo>(fvti);
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wangpc-pp wrote:

`is_group`->`isGroup`

https://github.com/llvm/llvm-project/pull/71501