[clang] [Offload] Fix unused variable warning when assertions are disabled (PR #216177)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-driver

Author: Sophia Herrmann (jellytabby)

<details>
<summary>Changes</summary>

The `UsesLLVMOffloading` variable is not used when assertions are disabled, causing a warning. This fix surpresses that with `[[maybe_unused]]`

---
Full diff: https://github.com/llvm/llvm-project/pull/216177.diff


1 Files Affected:

- (modified) clang/lib/Driver/ToolChains/Cuda.cpp (+1-1) 


``````````diff
diff --git a/clang/lib/Driver/ToolChains/Cuda.cpp b/clang/lib/Driver/ToolChains/Cuda.cpp
index 77d1f6bb556d5..6036b612b88c0 100644
--- a/clang/lib/Driver/ToolChains/Cuda.cpp
+++ b/clang/lib/Driver/ToolChains/Cuda.cpp
@@ -601,7 +601,7 @@ void NVPTX::Linker::ConstructJob(Compilation &C, const JobAction &JA,
       static_cast<const toolchains::NVPTXToolChain &>(getToolChain());
   ArgStringList CmdArgs;
 
-  bool UsesLLVMOffloading = Args.hasFlag(
+  [[maybe_unused]] bool UsesLLVMOffloading = Args.hasFlag(
       options::OPT_foffload_via_llvm, options::OPT_fno_offload_via_llvm, false);
   assert((UsesLLVMOffloading || TC.getTriple().isNVPTX()) && "Wrong platform");
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/216177