[BuildLibCalls][NFC] Remove redundant attribute list from emitCalloc

Additionally with this patch aligned DSE which is the only user of emitCalloc.

Differential Revision: https://reviews.llvm.org/D103523

Author: yurai007

llvm/include/llvm/Transforms/Utils/BuildLibCalls.h

@@ -205,8 +205,8 @@ namespace llvm {
                     const TargetLibraryInfo *TLI);
 
   /// Emit a call to the calloc function.
-  Value *emitCalloc(Value *Num, Value *Size, const AttributeList &Attrs,
-                    IRBuilderBase &B, const TargetLibraryInfo &TLI);
+  Value *emitCalloc(Value *Num, Value *Size, IRBuilderBase &B,
+                    const TargetLibraryInfo &TLI);
 }
 
 #endif

llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp

@@ -1856,10 +1856,9 @@ struct DSEState {
                 memoryIsNotModifiedBetween(Malloc, MemSet, BatchAA, DL, &DT)) {
               IRBuilder<> IRB(Malloc);
               const auto &DL = Malloc->getModule()->getDataLayout();
-              AttributeList EmptyList;
-              if (auto *Calloc = emitCalloc(
-                      ConstantInt::get(IRB.getIntPtrTy(DL), 1),
-                      Malloc->getArgOperand(0), EmptyList, IRB, TLI)) {
+              if (auto *Calloc =
+                      emitCalloc(ConstantInt::get(IRB.getIntPtrTy(DL), 1),
+                                 Malloc->getArgOperand(0), IRB, TLI)) {
                 MemorySSAUpdater Updater(&MSSA);
                 auto *LastDef = cast<MemoryDef>(
                     Updater.getMemorySSA()->getMemoryAccess(Malloc));

llvm/lib/Transforms/Utils/BuildLibCalls.cpp

@@ -1655,17 +1655,17 @@ Value *llvm::emitMalloc(Value *Num, IRBuilderBase &B, const DataLayout &DL,
   return CI;
 }
 
-Value *llvm::emitCalloc(Value *Num, Value *Size, const AttributeList &Attrs,
-                        IRBuilderBase &B, const TargetLibraryInfo &TLI) {
+Value *llvm::emitCalloc(Value *Num, Value *Size, IRBuilderBase &B,
+                        const TargetLibraryInfo &TLI) {
   if (!TLI.has(LibFunc_calloc))
     return nullptr;
 
   Module *M = B.GetInsertBlock()->getModule();
   StringRef CallocName = TLI.getName(LibFunc_calloc);
   const DataLayout &DL = M->getDataLayout();
   IntegerType *PtrType = DL.getIntPtrType((B.GetInsertBlock()->getContext()));
-  FunctionCallee Calloc = M->getOrInsertFunction(
-      CallocName, Attrs, B.getInt8PtrTy(), PtrType, PtrType);
+  FunctionCallee Calloc =
+      M->getOrInsertFunction(CallocName, B.getInt8PtrTy(), PtrType, PtrType);
   inferLibFuncAttributes(M, CallocName, TLI);
   CallInst *CI = B.CreateCall(Calloc, {Num, Size}, CallocName);