[llvm] [DAGCombine] Invert vselect to make TrueValue is binop (PR #167499)

[Simon Pilgrim via llvm-commits]

================
@@ -814,6 +814,21 @@ define <vscale x 8 x i32> @vadd_vv_mask_nxv8i32(<vscale x 8 x i32> %va, <vscale
   ret <vscale x 8 x i32> %vc
 }
 
+define <vscale x 8 x i32> @vadd_vv_mask_nxv8i32_novmerge(<vscale x 8 x i32> %va, <vscale x 8 x i32> %vb,
+; CHECK-LABEL: vadd_vv_mask_nxv8i32_novmerge:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli a0, zero, e32, m4, ta, mu
+; CHECK-NEXT:    vmsne.vi v0, v8, 1
+; CHECK-NEXT:    vadd.vv v16, v16, v12, v0.t
+; CHECK-NEXT:    vmv.v.v v8, v16
+; CHECK-NEXT:    ret
+                                                         <vscale x 8 x i32> %vc) {
----------------
RKSimon wrote:

```
define <vscale x 8 x i32> @vadd_vv_mask_nxv8i32_novmerge(<vscale x 8 x i32> %va, <vscale x 8 x i32> %vb, <vscale x 8 x i32> %vc) {
```
to stop the update script splitting them 

https://github.com/llvm/llvm-project/pull/167499