[OMPIRBuilder] Remove unused functions (NFC) (#156)

This patch removes some internal functions from the OMPIRBuilder that are not
used and do not exist upstream. They seem to have been left behind after some
merge or improvements to reductions support made them redundant.

llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp

@@ -149,17 +149,6 @@ static bool isValidWorkshareLoopScheduleType(OMPScheduleType SchedType) {
 }
 #endif
 
-Function *GLOBAL_ReductionFunc = nullptr;
-
-static uint64_t getTypeSizeInBytes(Module &M, Type *Type) {
- return divideCeil(M.getDataLayout().getTypeSizeInBits(Type), 8);
-}
-
-static Value *getTypeSizeInBytesValue(IRBuilder<> &Builder, Module &M,
- Type *Type) {
- return Builder.getInt64(getTypeSizeInBytes(M, Type));
-}
-
 static const omp::GV &getGridValue(const Triple &T, Function *Kernel) {
  if (T.isAMDGPU()) {
  StringRef Features =
@@ -6692,27 +6681,6 @@ emitExecutionMode(OpenMPIRBuilder &OMPBuilder, IRBuilderBase &Builder,
  LLVMCompilerUsed.emplace_back(GVMode);
 }
 
-static void replaceConstatExprUsesInFuncWithInstr(ConstantExpr *ConstExpr,
- Function *Func) {
- for (User *User : make_early_inc_range(ConstExpr->users())) {
- if (auto *Instr = dyn_cast<Instruction>(User)) {
- if (Instr->getFunction() == Func) {
- Instruction *ConstInst = ConstExpr->getAsInstruction();
- ConstInst->insertBefore(*Instr->getParent(), Instr->getIterator());
- Instr->replaceUsesOfWith(ConstExpr, ConstInst);
- }
- }
- }
-}
-
-static void replaceConstantValueUsesInFuncWithInstr(llvm::Value *Input,
- Function *Func) {
- for (User *User : make_early_inc_range(Input->users()))
- if (auto *Const = dyn_cast<Constant>(User))
- if (auto *ConstExpr = dyn_cast<ConstantExpr>(Const))
- replaceConstatExprUsesInFuncWithInstr(ConstExpr, Func);
-}
-
 static Function *createOutlinedFunction(
  OpenMPIRBuilder &OMPBuilder, IRBuilderBase &Builder, bool IsSPMD,
  const OpenMPIRBuilder::TargetKernelDefaultBounds &DefaultBounds,