Use StringRef in Pass/PassManager APIs (NFC)

llvm-svn: 283004
diff --git a/llvm/lib/Target/X86/X86PadShortFunction.cpp b/llvm/lib/Target/X86/X86PadShortFunction.cpp
index cd70511..3069d1f 100644
--- a/llvm/lib/Target/X86/X86PadShortFunction.cpp
+++ b/llvm/lib/Target/X86/X86PadShortFunction.cpp
@@ -60,7 +60,7 @@
           MachineFunctionProperties::Property::NoVRegs);
     }
 
-    const char *getPassName() const override {
+    StringRef getPassName() const override {
       return "X86 Atom pad short functions";
     }