[llvm] [VPlan] Give VPInstruction::ExplicitVectorLength name. NFC (PR #175493)

[Luke Lau via llvm-commits]

https://github.com/lukel97 created https://github.com/llvm/llvm-project/pull/175493

This makes it a tad easier to read VPlan dumps, e.g.

    WIDEN vp.store vp<%7>, ir<%val>, vp<%5>
    ->
    WIDEN vp.store vp<%7>, ir<%val>, vp<%evl>


>From d6a29f95f174c4f33871ae7ee933570245d004cc Mon Sep 17 00:00:00 2001
From: Luke Lau <luke at igalia.com>
Date: Mon, 12 Jan 2026 15:29:25 +0800
Subject: [PATCH] [VPlan] Give VPInstruction::ExplicitVectorLength name. NFC

This makes it a tad easier to read VPlan dumps, e.g.

    WIDEN vp.store vp<%7>, ir<%val>, vp<%5>
    ->
    WIDEN vp.store vp<%7>, ir<%val>, vp<%evl>
---
 llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp b/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
index afa74937fc681..cdd1c854d20b4 100644
--- a/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
+++ b/llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
@@ -3202,7 +3202,7 @@ void VPlanTransforms::addExplicitVectorLength(
                                "safe_avl");
   }
   auto *VPEVL = Builder.createNaryOp(VPInstruction::ExplicitVectorLength, AVL,
-                                     DebugLoc::getUnknown());
+                                     DebugLoc::getUnknown(), "evl");
 
   auto *CanonicalIVIncrement =
       cast<VPInstruction>(CanonicalIVPHI->getBackedgeValue());