Rename PPCSubTarget to Subtarget in PPCTargetLowering for consistency.
Also remove an extra local subtarget in the initialization functions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210848 91177308-0d34-0410-b5e6-96231b3b80d8
Remove an extraneous this-> to access the subtarget.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210849 91177308-0d34-0410-b5e6-96231b3b80d8