[Bug 233037] math/gmp should enable assembly optimizations by default

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233037

            Bug ID: 233037
           Summary: math/gmp should enable assembly optimizations by
                    default
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ale at FreeBSD.org
          Reporter: dclarke at blastwave.org
             Flags: maintainer-feedback?(ale at FreeBSD.org)
          Assignee: ale at FreeBSD.org

This is more of an RFE than a "bug" but none the less I see that a
build of libgmp will disable the extensive assembly optimizations
by default. This is a significant performance impact by default and
the lib has been tested more than just about any other I know of.
It would be quite dafe and in fact recommended to enable these code
pieces that are hand crafted for certain architectures. 

Given that gmp and mpfr and mpc and isl are required for gcc bootstrap
this has also been tested extensively without any negative side effects.

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