[clang] [clang] Enable C++17 relaxed template template argument matching by default (PR #89807)

[Matheus Izvekov via cfe-commits]

mizvekov wrote:

Regarding @joanahalili 's post

Does it sound good for everyone that we revert the deprecation of the positive spelling of the flag for a while, until we come up with a patch for a new flag which helps ignore these deprecations?



https://github.com/llvm/llvm-project/pull/89807