[CallSite removal] Rename CallSite.h to AbstractCallSite.h. NFC

The CallSite and ImmutableCallSite were removed in a previous
commit. So rename the file to match the remaining class and
the name of the cpp that implements it.

include/llvm/IR/AbstractCallSite.h

@@ -1,4 +1,4 @@
-//===- CallSite.h - Abstract Call & Invoke instrs ---------------*- C++ -*-===//
+//===- AbstractCallSite.h - Abstract call sites -----------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
@@ -6,25 +6,22 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This file defines the AbstractCallSite class, which is a is a wrapper that 
+// This file defines the AbstractCallSite class, which is a is a wrapper that
 // allows treating direct, indirect, and callback calls the same.
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_IR_CALLSITE_H
-#define LLVM_IR_CALLSITE_H
+#ifndef LLVM_IR_ABSTRACTCALLSITE_H
+#define LLVM_IR_ABSTRACTCALLSITE_H
 
 #include "llvm/IR/Function.h"
 #include "llvm/IR/InstrTypes.h"
 #include "llvm/IR/Instruction.h"
-#include "llvm/IR/Instructions.h"
 #include "llvm/IR/Use.h"
 #include "llvm/IR/User.h"
 #include "llvm/IR/Value.h"
 #include "llvm/Support/Casting.h"
 #include <cassert>
-#include <cstdint>
-#include <iterator>
 
 namespace llvm {
 
@@ -220,4 +217,4 @@ public:
 
 } // end namespace llvm
 
-#endif // LLVM_IR_CALLSITE_H
+#endif // LLVM_IR_ABSTRACTCALLSITE_H

include/llvm/Transforms/IPO/Attributor.h

@@ -111,7 +111,7 @@
 #include "llvm/Analysis/PostDominators.h"
 #include "llvm/Analysis/TargetLibraryInfo.h"
 #include "llvm/Analysis/TargetTransformInfo.h"
-#include "llvm/IR/CallSite.h"
+#include "llvm/IR/AbstractCallSite.h"
 #include "llvm/IR/ConstantRange.h"
 #include "llvm/IR/PassManager.h"
 #include "llvm/Support/Allocator.h"

include/llvm/module.modulemap

@@ -234,7 +234,7 @@ module LLVM_intrinsic_gen {
     extern module LLVM_Extern_IR_Attributes_Gen "module.extern.modulemap"
     export *
   }
-  module IR_CallSite { header "IR/CallSite.h" export * }
+  module IR_AbstractCallSite { header "IR/AbstractCallSite.h" export * }
   module IR_ConstantFolder { header "IR/ConstantFolder.h" export * }
   module IR_GlobalVariable { header "IR/GlobalVariable.h" export * }
   module IR_NoFolder { header "IR/NoFolder.h" export * }

lib/IR/AbstractCallSite.cpp

@@ -14,9 +14,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "llvm/IR/AbstractCallSite.h"
 #include "llvm/ADT/Statistic.h"
-#include "llvm/ADT/StringSwitch.h"
-#include "llvm/IR/CallSite.h"
 #include "llvm/Support/Debug.h"
 
 using namespace llvm;

lib/Transforms/IPO/IPConstantPropagation.cpp

@@ -17,7 +17,7 @@
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/Analysis/ValueTracking.h"
-#include "llvm/IR/CallSite.h"
+#include "llvm/IR/AbstractCallSite.h"
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/Instructions.h"
 #include "llvm/IR/Module.h"