[NVPTX] Add missing pass names

llvm/lib/Target/NVPTX/NVPTXImageOptimizer.cpp

private:
   static char ID;
   SmallVector<Instruction*, 4> InstrToDelete;
 
 public:
   NVPTXImageOptimizer();
 
   bool runOnFunction(Function &F) override;
 
+  StringRef getPassName() const override { return "NVPTX Image Optimizer"; }
+
 private:
   bool replaceIsTypePSampler(Instruction &I);
   bool replaceIsTypePSurface(Instruction &I);
   bool replaceIsTypePTexture(Instruction &I);
   Value *cleanupValue(Value *V);
   void replaceWith(Instruction *From, ConstantInt *To);
 };
 }

llvm/lib/Target/NVPTX/NVPTXPrologEpilogPass.cpp

 namespace {
 class NVPTXPrologEpilogPass : public MachineFunctionPass {
 public:
   static char ID;
   NVPTXPrologEpilogPass() : MachineFunctionPass(ID) {}
 
   bool runOnMachineFunction(MachineFunction &MF) override;
 
+  StringRef getPassName() const override { return "NVPTX Prolog Epilog Pass"; }
+
 private:
   void calculateFrameObjectOffsets(MachineFunction &Fn);
 };
 }
 
 MachineFunctionPass *llvm::createNVPTXPrologEpilogPass() {
   return new NVPTXPrologEpilogPass();
 }

llvm/test/CodeGen/NVPTX/pass-name.ll

+; Check that all passes have names
+; RUN: llc %s -march=nvptx64 -O3 --debug-pass=Structure -o /dev/null 2>&1 | FileCheck %s
+; CHECK-NOT: Unnamed pass