[AMDGPU] Fixed incorrect test in vcnd/vcmp optimization

[tpr]

Summary

This fixes a test I introduced in change D59191 (that added src0 and
src1 modifiers to the v_cndmask instruction for disassembly purposes).

Spotted by David Binderman in bug 41488.

Change-Id: I6ac95e66cd84e812ed3359ad57bcd0e13198ba0c

[tpr]

I did not add a test because I believe that we do not currently set the source modifiers in codegen, so this code never gets exercised.

[arsenm]

LGTM. We should probably start matching these though

llvm/trunk/lib/Target/AMDGPU/SIOptimizeExecMaskingPreRA.cpp

if (!Op1->isReg() || !Op2->isImm() || Op2->getImm() != 1)
     return AMDGPU::NoRegister;
 
   unsigned SelReg = Op1->getReg();
   auto *Sel = TRI->findReachingDef(SelReg, Op1->getSubReg(), *Cmp, MRI, LIS);
   if (!Sel || Sel->getOpcode() != AMDGPU::V_CNDMASK_B32_e64)
     return AMDGPU::NoRegister;
 
   if (TII->hasModifiersSet(*Sel, AMDGPU::OpName::src0_modifiers) ||
-      TII->hasModifiersSet(*Sel, AMDGPU::OpName::src0_modifiers))
+      TII->hasModifiersSet(*Sel, AMDGPU::OpName::src1_modifiers))
     return AMDGPU::NoRegister;
 
   Op1 = TII->getNamedOperand(*Sel, AMDGPU::OpName::src0);
   Op2 = TII->getNamedOperand(*Sel, AMDGPU::OpName::src1);
   MachineOperand *CC = TII->getNamedOperand(*Sel, AMDGPU::OpName::src2);
   if (!Op1->isImm() || !Op2->isImm() || !CC->isReg() ||
       Op1->getImm() != 0 || Op2->getImm() != 1)
     return AMDGPU::NoRegister;