[NFC] Fic clangIR build after #158679
The commit from #158679 added getStaticTripCount to LoopLikeOpInterface,
which the CIRLoopOpInterface uses. However, it doesn't include APInt.
This patch adds an include for APInt to CIRLoopOpInterface, plus a
'using', as we're likely to run into this again.
diff --git a/clang/include/clang/CIR/Interfaces/CIRLoopOpInterface.h b/clang/include/clang/CIR/Interfaces/CIRLoopOpInterface.h
index 3722c5e..90fd079 100644
--- a/clang/include/clang/CIR/Interfaces/CIRLoopOpInterface.h
+++ b/clang/include/clang/CIR/Interfaces/CIRLoopOpInterface.h
@@ -13,12 +13,14 @@
#ifndef CLANG_CIR_INTERFACES_CIRLOOPOPINTERFACE_H
#define CLANG_CIR_INTERFACES_CIRLOOPOPINTERFACE_H
+#include "llvm/ADT/APInt.h"
#include "mlir/IR/BuiltinTypes.h"
#include "mlir/IR/OpDefinition.h"
#include "mlir/IR/Operation.h"
#include "mlir/Interfaces/ControlFlowInterfaces.h"
#include "mlir/Interfaces/LoopLikeInterface.h"
+using llvm::APInt;
namespace cir {
namespace detail {
