[PPC64LE] Properly initialize instr-info in PPCVSXSwapRemoval pass

Replace some hacky code with the proper way to get at this data.

No functional change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@251848 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/PowerPC/PPCVSXSwapRemoval.cpp

@@ -220,7 +220,7 @@ struct PPCVSXSwapRemoval : public MachineFunctionPass {
 void PPCVSXSwapRemoval::initialize(MachineFunction &MFParm) {
   MF = &MFParm;
   MRI = &MF->getRegInfo();
-  TII = static_cast<const PPCInstrInfo*>(MF->getSubtarget().getInstrInfo());
+  TII = MF->getSubtarget<PPCSubtarget>().getInstrInfo();
 
   // An initial vector size of 256 appears to work well in practice.
   // Small/medium functions with vector content tend not to incur a