Remove dead var, fix bad override.

llvm-svn: 28264
diff --git a/llvm/lib/Target/PowerPC/PPCTargetMachine.h b/llvm/lib/Target/PowerPC/PPCTargetMachine.h
index ea42989..0679945 100644
--- a/llvm/lib/Target/PowerPC/PPCTargetMachine.h
+++ b/llvm/lib/Target/PowerPC/PPCTargetMachine.h
@@ -41,7 +41,9 @@
   virtual const TargetFrameInfo  *getFrameInfo() const { return &FrameInfo; }
   virtual       TargetJITInfo    *getJITInfo()         { return &JITInfo; }
   virtual const TargetSubtarget  *getSubtargetImpl() const{ return &Subtarget; }
-  virtual       PPCTargetLowering *getTargetLowering() { return &TLInfo; }
+  virtual       PPCTargetLowering *getTargetLowering() const { 
+   return const_cast<PPCTargetLowering*>(&TLInfo); 
+  }
   virtual const MRegisterInfo    *getRegisterInfo() const {
     return &InstrInfo.getRegisterInfo();
   }