[AArch64] Mark a variable as maybe unused. NFC.

[mstorsjo]

This avoids the following warning if building with asserts disabled:

../lib/Target/AArch64/AArch64ISelLowering.cpp:19079:7: warning: unused variable 'VT' [-Wunused-variable]
 19079 |   MVT VT = N->getSimpleValueType(0);
       |       ^~

[llvmbot]

@llvm/pr-subscribers-backend-aarch64

Author: Martin Storsjö (mstorsjo)

Changes

This avoids the following warning if building with asserts disabled:

../lib/Target/AArch64/AArch64ISelLowering.cpp:19079:7: warning: unused variable 'VT' [-Wunused-variable]
 19079 |   MVT VT = N->getSimpleValueType(0);
       |       ^~

---

Full diff: https://github.com/llvm/llvm-project/pull/159344.diff

1 Files Affected:

• (modified) llvm/lib/Target/AArch64/AArch64ISelLowering.cpp (+1-1)

diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
index 0ca5e89263b72..f516381b95ff6 100644
--- a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -19076,7 +19076,7 @@ static SDValue performUADDVCombine(SDNode *N, SelectionDAG &DAG) {
   }
 
   // uaddv(A) --> A if all lanes of A are known to be zeros except the 0th lane.
-  MVT VT = N->getSimpleValueType(0);
+  [[maybe_unused]] MVT VT = N->getSimpleValueType(0);
   MVT OpVT = A.getSimpleValueType();
   assert(VT == OpVT &&
          "The operand type should be consistent with the result type of UADDV");

[mstorsjo]

This was fixed differently by 1c2d7b3, so closing this one.