fix clang format

Author: lei137

llvm/lib/Target/PowerPC/PPCRegisterInfo.cpp

@@ -1256,7 +1256,7 @@ void PPCRegisterInfo::lowerOctWordSpilling(MachineBasicBlock::iterator II,
   bool IsKilled = MI.getOperand(0).isKill();
 
   assert(PPC::VSRpRCRegClass.contains(SrcReg) &&
-          "Expecting STXVP to be utilizing a VSRp register.");
+         "Expecting STXVP to be utilizing a VSRp register.");
 
   addFrameReference(
       BuildMI(MBB, II, DL, TII.get(PPC::STXV))