[Support] Stop including cstddef (NFC)

kazutakahirata · kazutakahirata · commit 37a530497658 · 2023-10-12T22:20:14.000-07:00
SwapByteOrder.h doesn't use anything from &lt;cstddef&gt;.
diff --git a/llvm/include/llvm/Support/SwapByteOrder.h b/llvm/include/llvm/Support/SwapByteOrder.h
@@ -15,7 +15,6 @@
 #define LLVM_SUPPORT_SWAPBYTEORDER_H
 
 #include "llvm/ADT/bit.h"
-#include <cstddef>
 #include <cstdint>
 #include <type_traits>
 
