Use StringRef in Pass/PassManager APIs (NFC)

llvm-svn: 283004
diff --git a/llvm/lib/Target/ARM/MLxExpansionPass.cpp b/llvm/lib/Target/ARM/MLxExpansionPass.cpp
index 26745be..744761b 100644
--- a/llvm/lib/Target/ARM/MLxExpansionPass.cpp
+++ b/llvm/lib/Target/ARM/MLxExpansionPass.cpp
@@ -43,7 +43,7 @@
 
     bool runOnMachineFunction(MachineFunction &Fn) override;
 
-    const char *getPassName() const override {
+    StringRef getPassName() const override {
       return "ARM MLA / MLS expansion pass";
     }