Summary:
`CKComponentAccessibilityContext::operator==` can be extremely expensive; it may invoke the `accessibilityLazyTextBlock` for its `CKComponentAccessibilityTextAttribute` members, and that can do a lot of string construction.
I could refactor this to make it cheaper, e.g. by migrating to a function-pointer-and-context-object approach. But the easiest thing to do is to simply remove it; I don't think it's meaningfully used.
Reviewed By: kevin0571
Differential Revision: D22322108
fbshipit-source-id: 82a0548d6dd28ec4adf2f3ba85705eabf665d100
993dbef7b8