[Bug 233956] emulators/fs-uae: ~20% performance drop when compiled with clang vs gcc

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233956

            Bug ID: 233956
           Summary: emulators/fs-uae: ~20% performance drop when compiled
                    with clang vs gcc
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: johalun0 at gmail.com
                CC: fernape at FreeBSD.org, tomse at oagd.net
             Flags: maintainer-feedback?(tomse at oagd.net)
                CC: tomse at oagd.net

Hi

I did some comparisons running sysinfo 5 times for each test with one complete
restart of fs-uae in between. Here's what I got: 

68040/040 sysinfo test, fs-uae compiled with clang, 13-CURRENT amd64
Dhrystone 72223, 69189, 75229, 75808, 76020

68040/040 sysinfo test, fs-uae compiled with gcc7
Dhrystone 92611, 92801, 92660, 92489, 90485

If there are no objections, I think we should switch over to compiling the port
with gcc.

NOTE: These tests were done on fs-uae 2.9.7 but I've confirmed similar
differences with 2.8.4.

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