Don't clear NoFPExcept flag after all

Author: JonPsson1

llvm/lib/Target/SystemZ/SystemZElimCompare.cpp

@@ -555,7 +555,7 @@ bool SystemZElimCompare::optimizeCompareZero(
 
   // Also do a forward search to handle cases where an instruction after the
   // compare can be converted, like
-  // LTGR %r0d, %r0d; %r1d = LGR %r0d  =>  LTGR %r1d, %r0d          XXXX
+  // CGHI %r0d, 0; %r1d = LGR %r0d  =>  LTGR %r1d, %r0d
   auto MIRange = llvm::make_range(
       std::next(MachineBasicBlock::iterator(&Compare)), MBB.end());
   for (MachineInstr &MI : llvm::make_early_inc_range(MIRange)) {

llvm/lib/Target/SystemZ/SystemZISelLowering.cpp

@@ -9188,9 +9188,6 @@ MachineBasicBlock *SystemZTargetLowering::emitLoadAndTestCmp0(
   DebugLoc DL = MI.getDebugLoc();
   Register SrcReg = MI.getOperand(0).getReg();
 
-  // This instruction will raise an exception if the input is a SNaN.
-  //  MI.clearFlag(MachineInstr::MIFlag::NoFPExcept);
-
   // Create new virtual register of the same class as source.
   const TargetRegisterClass *RC = MRI->getRegClass(SrcReg);
   Register DstReg = MRI->createVirtualRegister(RC);