Use StringRef in Pass/PassManager APIs (NFC)

llvm-svn: 283004
diff --git a/llvm/lib/Target/Hexagon/HexagonSplitDouble.cpp b/llvm/lib/Target/Hexagon/HexagonSplitDouble.cpp
index e4e259b..05d284c 100644
--- a/llvm/lib/Target/Hexagon/HexagonSplitDouble.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonSplitDouble.cpp
@@ -47,7 +47,7 @@
         TII(nullptr) {
       initializeHexagonSplitDoubleRegsPass(*PassRegistry::getPassRegistry());
     }
-    const char *getPassName() const override {
+    StringRef getPassName() const override {
       return "Hexagon Split Double Registers";
     }
     void getAnalysisUsage(AnalysisUsage &AU) const override {