Use StringRef in Pass/PassManager APIs (NFC)

llvm-svn: 283004
diff --git a/llvm/lib/Target/SystemZ/SystemZShortenInst.cpp b/llvm/lib/Target/SystemZ/SystemZShortenInst.cpp
index d36f051..43f01b0 100644
--- a/llvm/lib/Target/SystemZ/SystemZShortenInst.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZShortenInst.cpp
@@ -29,7 +29,7 @@
   static char ID;
   SystemZShortenInst(const SystemZTargetMachine &tm);
 
-  const char *getPassName() const override {
+  StringRef getPassName() const override {
     return "SystemZ Instruction Shortening";
   }