[RISCV] Fix copy/paste mistake in Sh3Add_UWPat. (#161923) This pattern is a copy of the pattern in Sh3AddPat but using sh3add.uw instead of sh3add. This is a mistake and the pattern should be the equivalent of the first pattern from Sh1Add_UWPat and Sh2Add_UWPat. These classes were created to share with Andes in a788a1abd9c88, but there was so many test changes in there that we must have overlooked the changes to Zba codegen.
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