Add missing include to llvm Allocator.h

This header is not self-contained otherwise.

PiperOrigin-RevId: 275651582

mlir/include/mlir/Support/StorageUniquer.h

@@ -21,6 +21,7 @@
 #include "mlir/Support/STLExtras.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/DenseSet.h"
+#include "llvm/Support/Allocator.h"
 
 namespace mlir {
 namespace detail {

mlir/lib/Support/StorageUniquer.cpp

@@ -16,9 +16,8 @@
 // =============================================================================
 
 #include "mlir/Support/StorageUniquer.h"
+
 #include "mlir/Support/LLVM.h"
-#include "llvm/ADT/DenseMap.h"
-#include "llvm/Support/Allocator.h"
 #include "llvm/Support/RWMutex.h"
 
 using namespace mlir;