Grab a subtarget off of a MipsTargetMachine rather than a
bare target machine in preparation for the TargetMachine bare
getSubtarget/getSubtargetImpl calls going away.

llvm-svn: 232877
diff --git a/llvm/lib/Target/Mips/MipsTargetObjectFile.h b/llvm/lib/Target/Mips/MipsTargetObjectFile.h
index 3a2b298..45ed9d0 100644
--- a/llvm/lib/Target/Mips/MipsTargetObjectFile.h
+++ b/llvm/lib/Target/Mips/MipsTargetObjectFile.h
@@ -13,11 +13,11 @@
 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
 
 namespace llvm {
-
+class MipsTargetMachine;
   class MipsTargetObjectFile : public TargetLoweringObjectFileELF {
     const MCSection *SmallDataSection;
     const MCSection *SmallBSSSection;
-    const TargetMachine *TM;
+    const MipsTargetMachine *TM;
   public:
 
     void Initialize(MCContext &Ctx, const TargetMachine &TM) override;