When __FILE__ is template parameter, force inlining.

[JohanEngelen]

A function with __FILE__ as default template parameter must explicitly be marked with pragma(inline, true) otherwise linking problems may occur:

void foo(string file = __FILE__)(){ ...}

See the forum discussion:
https://forum.dlang.org/post/induraqegvpyomvzxwmf@forum.dlang.org

This issue is to track progress, and as an easy referral.

A possible solution is to "infer" pragma(inline, true) when __FILE__ is used as default parameter.