[llvm] [LTO] Fix a unused variable error (PR #107660)

[Mingming Liu via llvm-commits]

https://github.com/minglotus-6 created https://github.com/llvm/llvm-project/pull/107660

Fix unused `EntryCount` error in https://lab.llvm.org/buildbot/#/builders/66/builds/3610 and https://lab.llvm.org/buildbot/#/builders/168/builds/3029

>From 05d5fe618853fe2cfdba1d988f4f77ecd7bfb136 Mon Sep 17 00:00:00 2001
From: mingmingl <mingmingl at google.com>
Date: Fri, 6 Sep 2024 17:16:22 -0700
Subject: [PATCH] Fix a unused variable error

---
 llvm/lib/Bitcode/Reader/BitcodeReader.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
index 250ba425a5d591..9eafb90dae7663 100644
--- a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -7792,7 +7792,6 @@ Error ModuleSummaryIndexBitcodeReader::parseEntireSummary(unsigned ID) {
       uint64_t RawFlags = Record[2];
       unsigned InstCount = Record[3];
       uint64_t RawFunFlags = 0;
-      uint64_t EntryCount = 0;
       unsigned NumRefs = Record[4];
       unsigned NumRORefs = 0, NumWORefs = 0;
       int RefListStartIndex = 5;
@@ -7806,7 +7805,8 @@ Error ModuleSummaryIndexBitcodeReader::parseEntireSummary(unsigned ID) {
           RefListStartIndex = 7;
           if (Version >= 6) {
             NumRefsIndex = 6;
-            EntryCount = Record[5];
+            // Record[5] is reserved for an obsolete field. Bitcode writer
+            // writes a dummy zero.
             RefListStartIndex = 8;
             if (Version >= 7) {
               RefListStartIndex = 9;