[clang] [llvm] [mlir] [AArch64][SME] Improve codegen for aarch64.sme.cnts* when not in streaming mode (PR #154761)

[Kerry McLaughlin via cfe-commits]

================
@@ -937,6 +940,26 @@ bool AArch64DAGToDAGISel::SelectRDVLImm(SDValue N, SDValue 
&Imm) {
   return false;
 }
 
+// Given cntsd = (rdsvl, #1) >> 3, attempt to return a suitable multiplier
+// for RDSVL to calculate the streaming vector length in bytes * N. i.e.
+//   rdsvl, #(ShlImm - 3)
----------------
kmclaughlin-arm wrote:

Thanks, I missed this too!

https://github.com/llvm/llvm-project/pull/154761
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