replace section brackets with linker script

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Martin Nowak (@MartinNowak) reported this on 2014-05-10T00:47:46Z

Transferred from https://issues.dlang.org/show_bug.cgi?id=12726

Description

Currently we're relying on the order of unknown output section to frame certain sections (minfo, deh) with runtime accessibly brackets. A cleaner solution would be to use PROVIDE_HIDDEN(_mingo_beg) in a linker script.
It's possible to extend the default linker scripts using -T and the INSERT command, see http://sourceware.org/binutils/docs/ld/Miscellaneous-Commands.html#Miscellaneous-Commands

[dlangBugzillaToGithub]

code (@MartinNowak) commented on 2015-02-18T22:47:40Z

Maybe we can use the implicit linker section support of the linker.

http://www.airs.com/blog/archives/56