clang-format does bad things with requires + decltype(auto)

[danakj]

.clang-format:

BasedOnStyle: Google
Standard: Latest
AllowShortCaseLabelsOnASingleLine: true

The decltype(auto) is on the same line as the requires clause.

  template <class T>
    requires(std::same_as<int, T>) decltype(auto)
  oops() {}

Inserting //clang-format off makes it worse

  template <class T>
  // clang-format off
    requires(std::same_as<int, T>)
      // clang-format on
      decltype(auto)
    oops() {}

[llvmbot]

@llvm/issue-subscribers-clang-format

[rymiel]

Patch: https://reviews.llvm.org/D140312