message: Don't look up invalid instruction on final shader debug step
diff: @@ -2183,7 +2183,8 @@ void ExtractInputsPS(PSInput IN, float4 debug_pixelPos : SV_Position, uint prim
  if(dxbc->m_DebugInfo)
  {
  - const ASMOperation &op = dxbc->GetInstruction((size_t)s.nextInstruction);
  + size_t inst = RDCMIN((size_t)s.nextInstruction, dxbc->GetNumInstructions() - 1);
  + const ASMOperation &op = dxbc->GetInstruction(inst);
  dxbc->m_DebugInfo->GetLocals(s.nextInstruction, op.offset, s.locals);
  }
  