MFC r345806:
Pull in r357362 from upstream clang trunk (by David Chisnall):
[objc-gnustep] Use .init_array not .ctors when requested. This doesn't make a difference most of the time but FreeBSD/ARM doesn't run anything in the .ctors array.
This should help with updating the libobjc2 port for armv7.
Requested by: theraven
Upstream PR: https://github.com/gnustep/libobjc2/issues/83