[Bug 242266] CLang 6.0.1 (Part of the System 12.0) can not Build CLang 8.0.1 from the Port Collection

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242266

--- Comment #5 from CrazyMihey <CrazyMihey at Ya.Ru> ---
«-march=native» is very usefull for further Work and «-O3» makes a Good Profit
on «i386» (even Simple Test with «UBench»), but actually No Profit on «AMD64».
Maybe because all AMD64/EM64T CPUs can execute SSE2, but not all x86 can.

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