[clang] Minor unused variable error for sanitizer builds (PR #132372)

[CHANDRA GHALE via cfe-commits]

https://github.com/chandraghale created https://github.com/llvm/llvm-project/pull/132372

Fix to issue [https://github.com/llvm/llvm-project/issues/132371 ](https://github.com/llvm/llvm-project/issues/132371 )
Minor error ,  sanitizer builds are failing for unused variable.  
sanitizer-aarch64-linux/build/llvm-project/clang/lib/Serialization/ASTReader.cpp:11764:17: error: unused variable 'I' [-Werror,-Wunused-variable]
 11764 |   for (unsigned I : llvm::seq<unsigned>(NumFlags))

This was modified as part of [https://github.com/llvm/llvm-project/pull/129938](https://github.com/llvm/llvm-project/pull/129938) , which got missed. 

>From 7769abef03a3a657942c24f794541ea01eee6743 Mon Sep 17 00:00:00 2001
From: Chandra Ghale <ghale at pe31.hpc.amslabs.hpecorp.net>
Date: Fri, 21 Mar 2025 05:48:03 -0500
Subject: [PATCH] Minor unused variable error for sanitizer builds

---
 clang/lib/Serialization/ASTReader.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index 930134bcd6501..c66ea5a2c0346 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -11761,7 +11761,7 @@ void OMPClauseReader::VisitOMPReductionClause(OMPReductionClause *C) {
   unsigned NumFlags = Record.readInt();
   SmallVector<bool, 16> Flags;
   Flags.reserve(NumFlags);
-  for (unsigned I : llvm::seq<unsigned>(NumFlags))
+  for ([[maybe_unused]] unsigned I : llvm::seq<unsigned>(NumFlags))
     Flags.push_back(Record.readInt());
   C->setPrivateVariableReductionFlags(Flags);
 }