Integrate from macperl:

Integrate from macperl:

[ 17345]
Mac OS Test updates

[ 17347]
Support hints and OPTIMIZE in MM_MacOS

[ 17348]
Crank down optimization for Mac OS in Digest::MD5
p4raw-link: @17348 on //depot/macperl: 5e6109b944d42c12b5bf2560bc7d5e1e26b50cb5
p4raw-link: @17347 on //depot/macperl: 4fa8a8856377f81f41ceaba369f758c11cc6b898
p4raw-link: @17345 on //depot/macperl: ef506d9df705afe007449cf4101370864d7e1d79

p4raw-id: //depot/perl@17363
p4raw-branched: from //depot/macperl@17362 'branch in'
	ext/Digest/MD5/hints/MacOS.pl
p4raw-integrated: from //depot/macperl@17362 'copy in'
	ext/POSIX/t/taint.t lib/ExtUtils/MM_MacOS.pm
	lib/Test/Harness/t/strap-analyze.t
	lib/Test/Harness/t/test-harness.t (@17344..)