[llvm] [BPF] Avoid repeated map lookups (NFC) (PR #131494)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/131494

None

>From cb6efe2b04579f0a3109666cc525e1bcda08d44f Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Sat, 15 Mar 2025 09:17:11 -0700
Subject: [PATCH] [BPF] Avoid repeated map lookups (NFC)

---
 llvm/lib/Target/BPF/BPFAbstractMemberAccess.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/Target/BPF/BPFAbstractMemberAccess.cpp b/llvm/lib/Target/BPF/BPFAbstractMemberAccess.cpp
index 3b336f87c9b34..d29ef24174b62 100644
--- a/llvm/lib/Target/BPF/BPFAbstractMemberAccess.cpp
+++ b/llvm/lib/Target/BPF/BPFAbstractMemberAccess.cpp
@@ -836,8 +836,9 @@ Value *BPFAbstractMemberAccess::computeBaseAndAccessKey(CallInst *Call,
   // Put the access chain into a stack with the top as the head of the chain.
   while (Call) {
     CallStack.push(std::make_pair(Call, CInfo));
-    CInfo = AIChain[Call].second;
-    Call = AIChain[Call].first;
+    auto &Chain = AIChain[Call];
+    CInfo = Chain.second;
+    Call = Chain.first;
   }
 
   // The access offset from the base of the head of chain is also