[libcxx-commits] [libcxx] [libc++][ranges][enumerate_view] Update sentinel `equal` test (PR #222331)

[Lucas Mellone via libcxx-commits]

lknknm wrote:

@Zingam @frederick-vs-ja please re-check. I manually copied the `adjacent_view` sentinel eq strategy plus added the `cpp20_input_iterator` one. I really think that testing against all the previous iterators is a bit reduntant, but it's up to you.

I also renamed the test to be `eq.pass.cpp` so we match the others in the suite.

https://github.com/llvm/llvm-project/pull/222331