[llvm] [Intrinsics][AArch64] Add intrinsics for masking off aliasing vector lanes (PR #117007)

[Sam Tebbs via llvm-commits]

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@@ -24210,11 +24202,11 @@ Semantics:
 The intrinsic returns ``poison`` if the distance between ``%prtA`` and ``%ptrB``
 is smaller than ``VF * %elementsize`` and either ``%ptrA + VF * %elementSize``
 or ``%ptrB + VF * %elementSize`` wrap.
-The element of the result mask is active when no read-after-write hazard occurs,
-meaning that:
+The element of the result mask is active when storing to %ptrA then loading from
+%ptrB is safe and doesn't result in aliasing, meaning that:
 
   abs(ptrB - ptrA) >= elementSize * lane (guarantees that the store of this lane
-  is committed before loading from this address)
+  occurs before loading from this address)
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SamTebbs33 wrote:

Done.

https://github.com/llvm/llvm-project/pull/117007