[Issue 18541] comparison `==` of two typeid() should always be rewritten as a "is"

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18541

--- Comment #5 from Steven Schveighoffer <schveiguy at yahoo.com> ---
Note that == will shortcut and return true if the two instances are the same
object.

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