[Bug 229788] march=ivybridge breaks certain ports

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229788

            Bug ID: 229788
           Summary: march=ivybridge breaks certain ports
           Product: Base System
           Version: 11.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: mi at FreeBSD.org
                CC: dim at FreeBSD.org, gerald at FreeBSD.org

The easiest way to reproduce this problem -- on a fresh FreeBSD-11.2/amd64 is
to attempt "make test" in multimedia/x265.

This works on my older system (where march is core2), but the two new ones --
with newer Ivy Bridge Xeons (E5-1620) -- break:

  ===>  Testing for x265-2.6_1
  /symbion/ports/multimedia/x265/work/x265_v2.6/source/test/TestBench
  Using random seed 5B4B6D10 12bit
  Testing primitives: SSE2
  Testing primitives: SSE3
  Testing primitives: SSSE3
  cuTreeFix8Pack failed

  x265: asm primitive has failed. Go and fix that Right Now!

it does not matter, whether OPTIMIZED_CFLAGS is enabled (which adds -O3) -- it
builds either way. The only way to get it through is to use a lower march (like
core2) or none at all.

Another port, which does not build properly with march=ivybridge for me is
qt5-core, but that's a lot hairier to deal with...

I noticed this problem after rebuilding world with the recently-committed
clang-6.0.1, but I haven't tested it with the earlier clang-6.0.0 so this may
be an older bug.

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