[clang] [clang] diagnose invalid std::tuple_size sizes (PR #159677)

[Younan Zhang via cfe-commits]

zyn0217 wrote:

> I mean do we need to use the other patch at all? Why not just backport this one?

I remembered adding a new diagnostic in a backport patch could cause an ABI break, since we can somehow change the enumeration order in the tablegen files.


https://github.com/llvm/llvm-project/pull/159677