[clang] [CIR][AArch64] Upstream addition-across-vector (incl. widening) NEON builtins (PR #193396)

[Vicky Nguyen via cfe-commits]

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@@ -4302,206 +4255,338 @@ float64_t test_vminnmvq_f64(float64x2_t a) {
 }
 
 //===----------------------------------------------------------------------===//
-// 2.1.3.2.2 Vector rounding shift right
-// https://arm-software.github.io/acle/neon_intrinsics/advsimd.html#vector-rounding-shift-right
+// 2.1.9.1 Addition across vector
----------------
iamvickynguyen wrote:

Thank you for catching this! I edited it.

https://github.com/llvm/llvm-project/pull/193396