[clang] [clang][Index] Add comment about out-of-line defaulted destructor (PR #138640)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Nathan Ridge (HighCommander4)

<details>
<summary>Changes</summary>



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Full diff: https://github.com/llvm/llvm-project/pull/138640.diff


1 Files Affected:

- (modified) clang/lib/Index/IndexingContext.h (+1) 


``````````diff
diff --git a/clang/lib/Index/IndexingContext.h b/clang/lib/Index/IndexingContext.h
index 01bfcb9d578bc..3d0606bac90c3 100644
--- a/clang/lib/Index/IndexingContext.h
+++ b/clang/lib/Index/IndexingContext.h
@@ -44,6 +44,7 @@ class IndexingContext {
 
 public:
   IndexingContext(IndexingOptions IndexOpts, IndexDataConsumer &DataConsumer);
+  // Defaulted, but defined out of line to avoid a dependency on HeuristicResolver.h.
   ~IndexingContext();
 
   const IndexingOptions &getIndexOpts() const { return IndexOpts; }

``````````

</details>


https://github.com/llvm/llvm-project/pull/138640