[clang] [clang-tools-extra] [clang] implement printing of canonical expressions (PR #135133)

[Matheus Izvekov via cfe-commits]

mizvekov wrote:

I've added a few test cases showing the effects on diagnostics.
Which is likely to be short lived, as the underlying issue looks easy to solve.

I have updated the patch to cover printing of dependent decltype as well.

I have looked into also covering DependentSizedArrays, but the sugaring there is broken at the moment
and would need a separate and more involved fix before we can turn this on there.


https://github.com/llvm/llvm-project/pull/135133