[clang] [CIR][AArch64] Upstream widening-addition NEON builtins (PR #204285)

[Jiahao Guo via cfe-commits]

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@@ -882,7 +882,16 @@ static mlir::Value emitCommonNeonBuiltinExpr(
   case NEON::BI__builtin_neon_vld3q_lane_v:
   case NEON::BI__builtin_neon_vld4_lane_v:
   case NEON::BI__builtin_neon_vld4q_lane_v:
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E00N777 wrote:

nit: A NYI guard is missing here.

https://github.com/llvm/llvm-project/pull/204285