[llvm] Use llvm::append_range (NFC) (#136066)

This patch replaces:

  llvm::copy(Src, std::back_inserter(Dst));

with:

  llvm::append_range(Dst, Src);

for breavity.

One side benefit is that llvm::append_range eventually calls
llvm::SmallVector::reserve if Dst is of llvm::SmallVector.

Author: kazutakahirata

llvm/include/llvm/Analysis/BlockFrequencyInfoImpl.h

@@ -1159,8 +1159,7 @@ void BlockFrequencyInfoImpl<BT>::setBlockFreq(const BlockT *BB,
 
 template <class BT> void BlockFrequencyInfoImpl<BT>::initializeRPOT() {
   const BlockT *Entry = &F->front();
-  RPOT.reserve(F->size());
-  std::copy(po_begin(Entry), po_end(Entry), std::back_inserter(RPOT));
+  llvm::append_range(RPOT, post_order(Entry));
   std::reverse(RPOT.begin(), RPOT.end());
 
   assert(RPOT.size() - 1 <= BlockNode::getMaxIndex() &&

llvm/include/llvm/Bitcode/BitcodeConvenience.h

@@ -266,7 +266,7 @@ template <typename ElementTy> class BCRecordCoding<BCArray<ElementTy>> {
       ElementTy::assertValid(element);
 #endif
     buffer.reserve(buffer.size() + std::distance(array.begin(), array.end()));
-    std::copy(array.begin(), array.end(), std::back_inserter(buffer));
+    llvm::append_range(buffer, array);
     Stream.EmitRecordWithAbbrev(code, buffer);
   }
 

llvm/include/llvm/IR/DiagnosticInfo.h

@@ -693,7 +693,7 @@ class DiagnosticInfoIROptimization : public DiagnosticInfoOptimizationBase {
             Orig.RemarkName, Orig.getFunction(), Orig.getLocation()),
         CodeRegion(Orig.getCodeRegion()) {
     *this << Prepend;
-    std::copy(Orig.Args.begin(), Orig.Args.end(), std::back_inserter(Args));
+    llvm::append_range(Args, Orig.Args);
   }
 
   /// Legacy interface.

llvm/lib/Analysis/LoopAccessAnalysis.cpp

@@ -563,7 +563,7 @@ void RuntimePointerChecking::groupChecks(
 
     // We've computed the grouped checks for this partition.
     // Save the results and continue with the next one.
-    llvm::copy(Groups, std::back_inserter(CheckingGroups));
+    llvm::append_range(CheckingGroups, Groups);
   }
 }
 

llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp

@@ -232,7 +232,7 @@ ArrayRef<Register> IRTranslator::getOrCreateVRegs(const Value &Val) {
     unsigned Idx = 0;
     while (auto Elt = C.getAggregateElement(Idx++)) {
       auto EltRegs = getOrCreateVRegs(*Elt);
-      llvm::copy(EltRegs, std::back_inserter(*VRegs));
+      llvm::append_range(*VRegs, EltRegs);
     }
   } else {
     assert(SplitTys.size() == 1 && "unexpectedly split LLT");

llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp

@@ -592,7 +592,7 @@ llvm::createLibcall(MachineIRBuilder &MIRBuilder, const char *Name,
         isLibCallInTailPosition(Result, *MI, MIRBuilder.getTII(),
                                 *MIRBuilder.getMRI());
 
-  std::copy(Args.begin(), Args.end(), std::back_inserter(Info.OrigArgs));
+  llvm::append_range(Info.OrigArgs, Args);
   if (!CLI.lowerCall(MIRBuilder, Info))
     return LegalizerHelper::UnableToLegalize;
 
@@ -708,7 +708,7 @@ llvm::createMemLibcall(MachineIRBuilder &MIRBuilder, MachineRegisterInfo &MRI,
       MI.getOperand(MI.getNumOperands() - 1).getImm() &&
       isLibCallInTailPosition(Info.OrigRet, MI, MIRBuilder.getTII(), MRI);
 
-  std::copy(Args.begin(), Args.end(), std::back_inserter(Info.OrigArgs));
+  llvm::append_range(Info.OrigArgs, Args);
   if (!CLI.lowerCall(MIRBuilder, Info))
     return LegalizerHelper::UnableToLegalize;
 
@@ -855,7 +855,7 @@ createAtomicLibcall(MachineIRBuilder &MIRBuilder, MachineInstr &MI) {
   Info.Callee = MachineOperand::CreateES(Name);
   Info.OrigRet = CallLowering::ArgInfo(RetRegs, RetTy, 0);
 
-  std::copy(Args.begin(), Args.end(), std::back_inserter(Info.OrigArgs));
+  llvm::append_range(Info.OrigArgs, Args);
   if (!CLI.lowerCall(MIRBuilder, Info))
     return LegalizerHelper::UnableToLegalize;
 

llvm/lib/CodeGen/ModuloSchedule.cpp

@@ -1855,9 +1855,9 @@ void PeelingModuloScheduleExpander::peelPrologAndEpilogs() {
 
   // Create a list of all blocks in order.
   SmallVector<MachineBasicBlock *, 8> Blocks;
-  llvm::copy(PeeledFront, std::back_inserter(Blocks));
+  llvm::append_range(Blocks, PeeledFront);
   Blocks.push_back(BB);
-  llvm::copy(PeeledBack, std::back_inserter(Blocks));
+  llvm::append_range(Blocks, PeeledBack);
 
   // Iterate in reverse order over all instructions, remapping as we go.
   for (MachineBasicBlock *B : reverse(Blocks)) {

llvm/lib/ExecutionEngine/JITLink/JITLink.cpp

@@ -313,7 +313,7 @@ void LinkGraph::dump(raw_ostream &OS) {
     OS << "section " << Sec->getName() << ":\n\n";
 
     std::vector<Block *> SortedBlocks;
-    llvm::copy(Sec->blocks(), std::back_inserter(SortedBlocks));
+    llvm::append_range(SortedBlocks, Sec->blocks());
     llvm::sort(SortedBlocks, [](const Block *LHS, const Block *RHS) {
       return LHS->getAddress() < RHS->getAddress();
     });
@@ -339,7 +339,7 @@ void LinkGraph::dump(raw_ostream &OS) {
       if (!B->edges_empty()) {
         OS << "    edges:\n";
         std::vector<Edge> SortedEdges;
-        llvm::copy(B->edges(), std::back_inserter(SortedEdges));
+        llvm::append_range(SortedEdges, B->edges());
         llvm::sort(SortedEdges, [](const Edge &LHS, const Edge &RHS) {
           return LHS.getOffset() < RHS.getOffset();
         });

llvm/lib/Transforms/Scalar/GVNSink.cpp

@@ -199,16 +199,16 @@ class ModelledPHI {
               SmallSetVector<BasicBlock *, 4> &B,
               const DenseMap<const BasicBlock *, unsigned> &BlockOrder) {
     // The order of Values and Blocks are already ordered by the caller.
-    llvm::copy(V, std::back_inserter(Values));
-    llvm::copy(B, std::back_inserter(Blocks));
+    llvm::append_range(Values, V);
+    llvm::append_range(Blocks, B);
     verifyModelledPHI(BlockOrder);
   }
 
   /// Create a PHI from [I[OpNum] for I in Insts].
   /// TODO: Figure out a way to verifyModelledPHI in this constructor.
   ModelledPHI(ArrayRef<Instruction *> Insts, unsigned OpNum,
               SmallSetVector<BasicBlock *, 4> &B) {
-    llvm::copy(B, std::back_inserter(Blocks));
+    llvm::append_range(Blocks, B);
     for (auto *I : Insts)
       Values.push_back(I->getOperand(OpNum));
   }

llvm/tools/llvm-jitlink/llvm-jitlink.cpp

@@ -2360,7 +2360,7 @@ static Error addLibraries(Session &S,
         SmallVector<char, 256> LibPath;
         LibPath.reserve(SearchPath.size() + strlen("lib") + LL.LibName.size() +
                         LibExt.size() + 2); // +2 for pathsep, null term.
-        llvm::copy(SearchPath, std::back_inserter(LibPath));
+        llvm::append_range(LibPath, SearchPath);
         if (LibExt != ".lib" && LibExt != ".dll")
           sys::path::append(LibPath, "lib" + LL.LibName + LibExt);
         else