[Issue 12311] Use `opCmp` for equality check if defined

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=12311



--- Comment #1 from Denis Shelomovskij <verylonglogin.reg at gmail.com> 2014-03-07 13:28:50 MSK ---
With such behaviour we can change associative arrays to use `equals` instead of
`compare` [1] without any breaking changes.

[1] https://github.com/D-Programming-Language/druntime/pull/522

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