Pass the Mangler by reference.

It is never null and it is not used in casts, so there is no reason to use a
pointer. This matches how we pass TM.

llvm-svn: 201025
diff --git a/llvm/lib/Target/Mips/MipsTargetObjectFile.h b/llvm/lib/Target/Mips/MipsTargetObjectFile.h
index 11d70db..d61e8fd 100644
--- a/llvm/lib/Target/Mips/MipsTargetObjectFile.h
+++ b/llvm/lib/Target/Mips/MipsTargetObjectFile.h
@@ -30,7 +30,7 @@
                                 const TargetMachine &TM) const;
 
     const MCSection *SelectSectionForGlobal(const GlobalValue *GV,
-                                            SectionKind Kind, Mangler *Mang,
+                                            SectionKind Kind, Mangler &Mang,
                                             const TargetMachine &TM) const
         LLVM_OVERRIDE;
   };