[examples] Fix llvm.memset prototype in BrainF example.

[rickyz]

Summary

Commit 1e68724d24ba38de7c7cdb2e1939d78c8b37cc0d removed the alignment
argument from the memset intrinsic. Update the BrainF example to match.

[jyknight]

Sounds good. Do you have commit access, or do you need me to commit this for you?

[rickyz]

I don't have commit access, so I think you'll have to commit it - thanks!

llvm/examples/BrainF/BrainF.cpp

 //===-- BrainF.cpp - BrainF compiler example ------------------------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 //
 // This class compiles the BrainF language into LLVM assembly.
Module *BrainF::parse(std::istream *in1, int mem, CompileFlags cf,
   return module;
 }
 
 void BrainF::header(LLVMContext& C) {
   module = new Module("BrainF", C);
 
   //Function prototypes
 
-  //declare void @llvm.memset.p0i8.i32(i8 *, i8, i32, i32, i1)
+  //declare void @llvm.memset.p0i8.i32(i8 *, i8, i32, i1)
   Type *Tys[] = { Type::getInt8PtrTy(C), Type::getInt32Ty(C) };
   Function *memset_func = Intrinsic::getDeclaration(module, Intrinsic::memset,
                                                     Tys);
 
   //declare i32 @getchar()
   getchar_func =
       module->getOrInsertFunction("getchar", IntegerType::getInt32Ty(C));
 
void BrainF::header(LLVMContext& C) {
   Type* IntPtrTy = IntegerType::getInt32Ty(C);
   Type* Int8Ty = IntegerType::getInt8Ty(C);
   Constant* allocsize = ConstantExpr::getSizeOf(Int8Ty);
   allocsize = ConstantExpr::getTruncOrBitCast(allocsize, IntPtrTy);
   ptr_arr = CallInst::CreateMalloc(BB, IntPtrTy, Int8Ty, allocsize, val_mem, 
                                    nullptr, "arr");
   BB->getInstList().push_back(cast<Instruction>(ptr_arr));
 
-  //call void @llvm.memset.p0i8.i32(i8 *%arr, i8 0, i32 %d, i32 1, i1 0)
+  //call void @llvm.memset.p0i8.i32(i8 *%arr, i8 0, i32 %d, i1 0)
   {
     Value *memset_params[] = {
       ptr_arr,
       ConstantInt::get(C, APInt(8, 0)),
       val_mem,
-      ConstantInt::get(C, APInt(32, 1)),
       ConstantInt::get(C, APInt(1, 0))
     };
 
     CallInst *memset_call = builder->
       CreateCall(memset_func, memset_params);
     memset_call->setTailCall(false);
   }