Return a StringRef from getSection.

This is similar to how getName is handled.

llvm-svn: 269218
diff --git a/llvm/lib/Object/IRObjectFile.cpp b/llvm/lib/Object/IRObjectFile.cpp
index 76cb156..46012b7 100644
--- a/llvm/lib/Object/IRObjectFile.cpp
+++ b/llvm/lib/Object/IRObjectFile.cpp
@@ -248,7 +248,7 @@
   if (GV->getName().startswith("llvm."))
     Res |= BasicSymbolRef::SF_FormatSpecific;
   else if (auto *Var = dyn_cast<GlobalVariable>(GV)) {
-    if (Var->getSection() == StringRef("llvm.metadata"))
+    if (Var->getSection() == "llvm.metadata")
       Res |= BasicSymbolRef::SF_FormatSpecific;
   }