[llvm] [RISCV] Use vsetvli instead of vlenb in Prologue/Epilogue (PR #113756)

[Craig Topper via llvm-commits]

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@@ -1534,6 +1534,12 @@ def TuneVentanaVeyron : SubtargetFeature<"ventana-veyron", "RISCVProcFamily", "V
 def TuneVXRMPipelineFlush : SubtargetFeature<"vxrm-pipeline-flush", "HasVXRMPipelineFlush",
                                              "true", "VXRM writes causes pipeline flush">;
 
+def TunePreferVsetvliOverReadVLENB
+    : SubtargetFeature<"prefer-vsetvli-over-read-vlenb",
+                       "PreferVsetvliOverReadVLENB",
+                       "true",
+                       "Prefer vsetvli over read vlenb CSR when calculate VLEN">;
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topperc wrote:

`when calculate` -> `to calculate`

https://github.com/llvm/llvm-project/pull/113756