[llvm] [LLVM] Add `llvm.masked.compress` intrinsic (PR #92289)

[Matt Arsenault via llvm-commits]

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@@ -1294,6 +1294,11 @@ enum NodeType {
   MLOAD,
   MSTORE,
 
+  // Masked compress - consecutively place vector elements based on mask
+  // e.g., vec = {A, B, C, D} and mask = 1010
+  //         --> {A, C, ?, ?} where ? is undefined
+  MCOMPRESS,
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arsenm wrote:

Expand the name to exactly match the intrinsic name 

https://github.com/llvm/llvm-project/pull/92289