[clang-format] mistaking reference for binary operator in macro with clang-format 19

[rmarker]

While trying out clang-format on the new 19.x branch, I discovered an issue with the formatting in macros.
It is incorrectly treating the rvalue reference as a binary operator.

In clang-format 18.1.7 with the default LLVM style:

#define RVALUE_COPY(CLASS)                                                     \
  CLASS(CLASS &&That) : my(std::move(That.my)) {}

In clang-format 19.1.0 (183e8ec)

#define RVALUE_COPY(CLASS)                                                     \
  CLASS(CLASS && That) : my(std::move(That.my)) {}

I also discovered that a similar thing happens with * and & as well. I.e.

#define PTR_COPY(CLASS)                                                     \
  CLASS(CLASS * That) : my(That->my) {}

#define REF_COPY(CLASS)                                                     \
  CLASS(CLASS & That) : my(That.my) {}

[owenca]

Bisected to ce1a874.

[rmarker]

While continuing to try out the new version, I've come across several more instances which could be the same issue.

clang-format 18.1.7

#define MACRO(MYTYPE)                                                          \
  template <> bool foo<MYTYPE>::bar(MYTYPE *Value, bool B) const {}

#define MACRO() template <typename... ARGS> Test(ARGS &&...);

#define MACRO() Foo(Foo &&That) noexcept;

#define MACRO(NAMESPACE) Foo fun_##NAMESPACE##_tion(Bar *Value);

clang-format 19.1.0

#define MACRO(MYTYPE)                                                          \
  template <> bool foo<MYTYPE>::bar(MYTYPE * Value, bool B) const {}

#define MACRO() template <typename... ARGS> Test(ARGS && ...);

#define MACRO() Foo(Foo && That) noexcept;

#define MACRO(NAMESPACE) Foo fun_##NAMESPACE##_tion(Bar * Value);

[owenca]

/cherry-pick 7e7a906

[llvmbot]

/pull-request #100499