message: fix crash in clang plugin
diff: @@ -218,10 +218,8 @@ struct TVPass final : public llvm::FunctionPass {
  auto [I, first] = fns.try_emplace(F.getName().str());
  - vector<string_view> src_global_vars;
  - if (!first)
  - src_global_vars = I->second.fn.getGlobalVarNames();
  - auto fn = llvm2alive(F, *TLI, src_global_vars);
  + auto fn = llvm2alive(F, *TLI, first ? vector<string_view>()
  + : I->second.fn.getGlobalVarNames());
  if (!fn) {
  fns.erase(I);
  return false;
  @@ -289,7 +287,7 @@ struct TVPass final : public llvm::FunctionPass {
  }
  // Regenerate tgt because preprocessing may have changed it
  - I->second.fn = *llvm2alive(F, *TLI, move(src_global_vars));
  + I->second.fn = *llvm2alive(F, *TLI);
  return false;
  }
  