[llvm] [BPF] Avoid repeated hash lookups (NFC) (PR #131265)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata updated https://github.com/llvm/llvm-project/pull/131265

>From cc39a284423a2ae5692875ac8e451ee4fd0e0c17 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Thu, 13 Mar 2025 17:43:19 -0700
Subject: [PATCH 1/2] [BPF] Avoid repeated hash lookups (NFC)

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

diff --git a/llvm/lib/Target/BPF/BTFDebug.cpp b/llvm/lib/Target/BPF/BTFDebug.cpp
index c58b61f628881..f91a65cce4fce 100644
--- a/llvm/lib/Target/BPF/BTFDebug.cpp
+++ b/llvm/lib/Target/BPF/BTFDebug.cpp
@@ -1026,8 +1026,9 @@ void BTFDebug::constructLineInfo(MCSymbol *Label, const DIFile *File,
   LineInfo.Label = Label;
   LineInfo.FileNameOff = addString(FileName);
   // If file content is not available, let LineOff = 0.
-  if (Line < FileContent[FileName].size())
-    LineInfo.LineOff = addString(FileContent[FileName][Line]);
+  auto &Content = FileContent[FileName];
+  if (Line < Content.size())
+    LineInfo.LineOff = addString(Content[Line]);
   else
     LineInfo.LineOff = 0;
   LineInfo.LineNum = Line;

>From 421f666c94fddeee987a1d246a9bb25b48f25a81 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Fri, 14 Mar 2025 07:17:06 -0700
Subject: [PATCH 2/2] Update llvm/lib/Target/BPF/BTFDebug.cpp

Co-authored-by: Nikita Popov <github at npopov.com>
---
 llvm/lib/Target/BPF/BTFDebug.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/lib/Target/BPF/BTFDebug.cpp b/llvm/lib/Target/BPF/BTFDebug.cpp
index f91a65cce4fce..8f2274eb75da8 100644
--- a/llvm/lib/Target/BPF/BTFDebug.cpp
+++ b/llvm/lib/Target/BPF/BTFDebug.cpp
@@ -1026,7 +1026,7 @@ void BTFDebug::constructLineInfo(MCSymbol *Label, const DIFile *File,
   LineInfo.Label = Label;
   LineInfo.FileNameOff = addString(FileName);
   // If file content is not available, let LineOff = 0.
-  auto &Content = FileContent[FileName];
+  const auto &Content = FileContent[FileName];
   if (Line < Content.size())
     LineInfo.LineOff = addString(Content[Line]);
   else