[llvm] Vector masked extract last active element intrinsic (PR #113587)

[Paul Walker via llvm-commits]

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@@ -19956,6 +19956,36 @@ the follow sequence of operations:
 
 The ``mask`` operand will apply to at least the gather and scatter operations.
 
+'``llvm.experimental.vector.masked.extract.last.active``' Intrinsic
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+This is an overloaded intrinsic.
+
+This intrinsic will extract the value from a single lane of a vector, based
+on a supplied mask vector.
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paulwalker-arm wrote:

This is not strictly true, but then is there any value in writing an incorrect description here when the semantics already document what the intrinsic does?

https://github.com/llvm/llvm-project/pull/113587