message: Fix off-by-one fetching callstack in DXBC. Closes
diff: @@ -1953,15 +1953,18 @@ void ThreadState::StepNext(ShaderDebugState *state, DebugAPIWrapper *apiWrapper,
  const Operation &op = program->GetInstruction((size_t)nextInstruction);
  - if(state && debug)
  - debug->GetCallstack(nextInstruction, op.offset, state->callstack);
  -
  apiWrapper->SetCurrentInstruction(nextInstruction);
  nextInstruction++;
  if(nextInstruction >= program->GetNumInstructions())
  nextInstruction--;
  + if(state && debug)
  + {
  + const Operation &nextOp = program->GetInstruction((size_t)nextInstruction);
  + debug->GetCallstack(nextInstruction, nextOp.offset, state->callstack);
  + }
  +
  rdcarray<ShaderVariable> srcOpers;
  VarType optype = OperationType(op.operation);
  