[clang] IntervalPartitionTest.cpp: Suppress a warning. [-Wunused-template] (PR #215564)

[NAKAMURA Takumi via cfe-commits]

https://github.com/chapuni created https://github.com/llvm/llvm-project/pull/215564

I think it'd be fair just to suppress since this is just a test.

>From 78801375bf30ef59abf60cb44c8ccc35c4132f46 Mon Sep 17 00:00:00 2001
From: NAKAMURA Takumi <geek4civic at gmail.com>
Date: Tue, 11 Aug 2026 21:48:26 +0900
Subject: [PATCH] IntervalPartitionTest.cpp: Suppress a warning.
 [-Wunused-template]

I think it'd be fair just to suppress since this is just a test.
---
 clang/unittests/Analysis/IntervalPartitionTest.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/clang/unittests/Analysis/IntervalPartitionTest.cpp b/clang/unittests/Analysis/IntervalPartitionTest.cpp
index 845608504a3d0..e2391ac56e69c 100644
--- a/clang/unittests/Analysis/IntervalPartitionTest.cpp
+++ b/clang/unittests/Analysis/IntervalPartitionTest.cpp
@@ -90,7 +90,7 @@ using ::testing::UnorderedElementsAre;
 
 MATCHER_P(intervalID, ID, "") { return arg->ID == ID; }
 
-template <typename... T> auto blockIDs(T... IDs) {
+template <typename... T> [[maybe_unused]] auto blockIDs(T... IDs) {
   return UnorderedElementsAre(Property(&CFGBlock::getBlockID, IDs)...);
 }