Use StringRef in Pass/PassManager APIs (NFC)

llvm-svn: 283004
diff --git a/llvm/lib/CodeGen/MachineFunctionPrinterPass.cpp b/llvm/lib/CodeGen/MachineFunctionPrinterPass.cpp
index 4f424ff..0d533c3 100644
--- a/llvm/lib/CodeGen/MachineFunctionPrinterPass.cpp
+++ b/llvm/lib/CodeGen/MachineFunctionPrinterPass.cpp
@@ -34,7 +34,7 @@
   MachineFunctionPrinterPass(raw_ostream &os, const std::string &banner)
       : MachineFunctionPass(ID), OS(os), Banner(banner) {}
 
-  const char *getPassName() const override { return "MachineFunction Printer"; }
+  StringRef getPassName() const override { return "MachineFunction Printer"; }
 
   void getAnalysisUsage(AnalysisUsage &AU) const override {
     AU.setPreservesAll();