Change target-specific classes to use more precise static types.
This eliminates the need for several awkward casts, including
the last dynamic_cast under lib/Target.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51091 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Mips/MipsTargetMachine.h b/lib/Target/Mips/MipsTargetMachine.h
index 2b877f2..8e08479 100644
--- a/lib/Target/Mips/MipsTargetMachine.h
+++ b/lib/Target/Mips/MipsTargetMachine.h
@@ -39,12 +39,12 @@
     { return &InstrInfo; }
     virtual const TargetFrameInfo *getFrameInfo()     const 
     { return &FrameInfo; }
-    virtual const TargetSubtarget *getSubtargetImpl() const 
+    virtual const MipsSubtarget   *getSubtargetImpl() const 
     { return &Subtarget; }
     virtual const TargetData      *getTargetData()    const 
     { return &DataLayout;}
 
-    virtual const TargetRegisterInfo   *getRegisterInfo()  const {
+    virtual const MipsRegisterInfo *getRegisterInfo()  const {
       return &InstrInfo.getRegisterInfo();
     }