[llvm] [RISCV] Add tests for vwaddu_wv+vabd(u) combine (PR #184962)

[Luke Lau via llvm-commits]

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@@ -482,6 +482,112 @@ define <vscale x 4 x i32> @uabd_non_matching_promotion(<vscale x 4 x i8> %a, <vs
   ret <vscale x 4 x i32> %abs
 }
 
+define <vscale x 8 x i16> @vwabda(<vscale x 8 x i16> %acc ,<vscale x 8 x i8> %a, <vscale x 8 x i8> %b) {
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lukel97 wrote:

Nit 
```suggestion
define <vscale x 8 x i16> @vwabda(<vscale x 8 x i16> %acc, <vscale x 8 x i8> %a, <vscale x 8 x i8> %b) {
```

And on the other functions

https://github.com/llvm/llvm-project/pull/184962