[Issue 6853] ParameterTypeTuple keeps storage class info but always compares equal

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=6853

Basile-z <b2.temp at gmx.com> changed:

           What    |Removed                     |Added
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          Component|dmd                         |phobos

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