[Issue 19785] top level const types in function parameters should not mangle as const

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19785

ag0aep6g <ag0aep6g at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |ag0aep6g at gmail.com

--- Comment #1 from ag0aep6g <ag0aep6g at gmail.com> ---
I suppose these should also mangle the same then:

    void foo(const int* p) {}
    void bar(const(int)* p) {}

And these, too:

    void foo(const int[] p) {}
    void bar(const(int)[] p) {}

I.e., remove the top level of const for mangling.

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