[Issue 17914] [Reg 2.075] Fibers guard page uses a lot more memory mappings

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17914

--- Comment #13 from github-bugzilla at puremagic.com ---
Commit pushed to master at https://github.com/dlang/phobos

https://github.com/dlang/phobos/commit/1c12d6d59e6a3eccf42efe379066c0a9c658fa36
Add std.concurrency.Generator overloads to accept Fiber's stack guard's size

As of 2.075 Fiber's stack protection pages are on by default, preventing
OS to merge mmaped ranges, so the total number of mmaped ranges is much
higher than before. In case there's no need for the stack overflow
protection and the high number of fibers, it may be wise to change this
setting, so the Generator's constructor overloads which support
this are added.

Fix issue 17914

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