[llvm] [RISCV] Make more vector pseudos commutable (PR #88379)

[Pengcheng Wang via llvm-commits]

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@@ -6159,7 +6167,7 @@ defm PseudoVLSEG : VPseudoUSSegLoadFF;
 //===----------------------------------------------------------------------===//
 // 11.1. Vector Single-Width Integer Add and Subtract
 //===----------------------------------------------------------------------===//
-defm PseudoVADD   : VPseudoVALU_VV_VX_VI;
+defm PseudoVADD   : VPseudoVALU_VV_VX_VI<Commutable=1>;
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wangpc-pp wrote:

For most RVV pseudos, only `_VV` variants can be commutable, so we can't simply wrap these `defm`s in `let isCommutable=1`.

https://github.com/llvm/llvm-project/pull/88379