[llvm] Add a missing include of <vector> (PR #225871)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-pgo

Author: lexi-nadia

<details>
<summary>Changes</summary>

This file used to get `<vector>` from DepthFirstIterator.h, but 7311a69f6caa2a6b50cfb899d4b8a1f9f9eeb210 removed the associated include.

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Full diff: https://github.com/llvm/llvm-project/pull/225871.diff


1 Files Affected:

- (modified) llvm/include/llvm/Transforms/Utils/SampleProfileInference.h (+1) 


``````````diff
diff --git a/llvm/include/llvm/Transforms/Utils/SampleProfileInference.h b/llvm/include/llvm/Transforms/Utils/SampleProfileInference.h
index fc054bb657968..a27fe10e3dc67 100644
--- a/llvm/include/llvm/Transforms/Utils/SampleProfileInference.h
+++ b/llvm/include/llvm/Transforms/Utils/SampleProfileInference.h
@@ -17,6 +17,7 @@
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/DepthFirstIterator.h"
 #include "llvm/ADT/SmallVector.h"
+#include <vector>
 
 namespace llvm {
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/225871