[llvm] [LV] Use value_or to simplify code. NFC (PR #77030)

[Craig Topper via llvm-commits]

https://github.com/topperc created https://github.com/llvm/llvm-project/pull/77030

None

>From 83da4c78efed995b72c669577d71aa43d05bd358 Mon Sep 17 00:00:00 2001
From: Craig Topper <craig.topper at sifive.com>
Date: Thu, 4 Jan 2024 12:43:14 -0800
Subject: [PATCH] [LV] Use value_or to simplify code. NFC

---
 llvm/lib/Transforms/Vectorize/LoopVectorize.cpp | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
index 10c068e3b5895c..d501307ec08546 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -5004,9 +5004,8 @@ VectorizationFactor LoopVectorizationPlanner::selectVectorizationFactor(
     VectorizationFactor Candidate(i, C.first, ScalarCost.ScalarCost);
 
 #ifndef NDEBUG
-    unsigned AssumedMinimumVscale = 1;
-    if (std::optional<unsigned> VScale = getVScaleForTuning(OrigLoop, TTI))
-      AssumedMinimumVscale = *VScale;
+    unsigned AssumedMinimumVscale =
+        getVScaleForTuning(OrigLoop, TTI).value_or(1);
     unsigned Width =
         Candidate.Width.isScalable()
             ? Candidate.Width.getKnownMinValue() * AssumedMinimumVscale