Use StringRef in Pass/PassManager APIs (NFC)

llvm-svn: 283004
diff --git a/llvm/lib/CodeGen/RegAllocGreedy.cpp b/llvm/lib/CodeGen/RegAllocGreedy.cpp
index 0c93d26..410a3ed 100644
--- a/llvm/lib/CodeGen/RegAllocGreedy.cpp
+++ b/llvm/lib/CodeGen/RegAllocGreedy.cpp
@@ -318,9 +318,7 @@
   RAGreedy();
 
   /// Return the pass name.
-  const char* getPassName() const override {
-    return "Greedy Register Allocator";
-  }
+  StringRef getPassName() const override { return "Greedy Register Allocator"; }
 
   /// RAGreedy analysis usage.
   void getAnalysisUsage(AnalysisUsage &AU) const override;