[llvm] Adjust inlucdes of ArrayRef.h (NFC)

Without this patch, CallingConvLower.h is relying on the transitive
include of ArrayRef.h in TypeSize.h, which doesn't need ArrayRef.h.

Author: kazutakahirata

llvm/include/llvm/CodeGen/CallingConvLower.h

@@ -14,6 +14,7 @@
 #ifndef LLVM_CODEGEN_CALLINGCONVLOWER_H
 #define LLVM_CODEGEN_CALLINGCONVLOWER_H
 
+#include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/CodeGen/Register.h"
 #include "llvm/CodeGen/TargetCallingConv.h"

llvm/include/llvm/Support/TypeSize.h

@@ -15,7 +15,6 @@
 #ifndef LLVM_SUPPORT_TYPESIZE_H
 #define LLVM_SUPPORT_TYPESIZE_H
 
-#include "llvm/ADT/ArrayRef.h"
 #include "llvm/Support/MathExtras.h"
 #include "llvm/Support/raw_ostream.h"