[llvm] [unused-includes][ADT] Don't include DJB.h as it's not used. NFC. (PR #88211)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-adt

Author: Volodymyr Sapsai (vsapsai)

<details>
<summary>Changes</summary>

StringMap uses xxHash instead of DJB.

---
Full diff: https://github.com/llvm/llvm-project/pull/88211.diff


1 Files Affected:

- (modified) llvm/include/llvm/ADT/StringMap.h (-1) 


``````````diff
diff --git a/llvm/include/llvm/ADT/StringMap.h b/llvm/include/llvm/ADT/StringMap.h
index 32e611467ac58e..453d91349e3585 100644
--- a/llvm/include/llvm/ADT/StringMap.h
+++ b/llvm/include/llvm/ADT/StringMap.h
@@ -17,7 +17,6 @@
 #include "llvm/ADT/StringMapEntry.h"
 #include "llvm/ADT/iterator.h"
 #include "llvm/Support/AllocatorBase.h"
-#include "llvm/Support/DJB.h"
 #include "llvm/Support/PointerLikeTypeTraits.h"
 #include <initializer_list>
 #include <iterator>

``````````

</details>


https://github.com/llvm/llvm-project/pull/88211