[lldb][NFC][CallSite] Remove CallSite use

[craig.topper]

LGTM

lldb/source/Plugins/LanguageRuntime/RenderScript/RenderScriptRuntime/RenderScriptx86ABIFixups.cpp

 //===-- RenderScriptx86ABIFixups.cpp --------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #include <set>
 
 #include "llvm/ADT/StringRef.h"
 #include "llvm/IR/BasicBlock.h"
-#include "llvm/IR/CallSite.h"
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/Function.h"
 #include "llvm/IR/Instruction.h"
 #include "llvm/IR/Instructions.h"
 #include "llvm/IR/Module.h"
 #include "llvm/IRReader/IRReader.h"
 #include "llvm/Pass.h"
 
bool fixupX86StructRetCalls(llvm::Module &module) {
   if (!findRSCallSites(module, rs_callsites, isRSLargeReturnCall))
     return false;
 
   for (auto call_inst : rs_callsites) {
     llvm::FunctionType *new_func_type = cloneToStructRetFnTy(call_inst);
     assert(new_func_type &&
            "failed to clone functionType for Renderscript ABI fixup");
 
-    llvm::CallSite call_site(call_inst);
     llvm::Function *func = call_inst->getCalledFunction();
     assert(func && "cannot resolve function in RenderScriptRuntime");
     // Copy the original call arguments
-    std::vector<llvm::Value *> new_call_args(call_site.arg_begin(),
-                                             call_site.arg_end());
+    std::vector<llvm::Value *> new_call_args(call_inst->arg_begin(),
+                                             call_inst->arg_end());
 
     // Allocate enough space to store the return value of the original function
     // we pass a pointer to this allocation as the StructRet param, and then
     // copy its value into the lldb return value
     const llvm::DataLayout &DL = module.getDataLayout();
     llvm::AllocaInst *return_value_alloc = new llvm::AllocaInst(
       func->getReturnType(), DL.getAllocaAddrSpace(), "var_vector_return_alloc",
       call_inst);