Bruce Mitchener 0880b2f3dd Remove UNSAFE flag. (#134) ...

This flag was for SunOS 3 and 4 on sun3 hardware (68k).

It enabled some unsafe optimizations via assembler. This hasn't
actually been built since the DOS port (since the header for this
was renamed, but the code in `xc.c` wasn't updated).

The optimizations here made assumptions that were specific to the
68k hardware and register allocation. They aren't likely to be
of much use moving forward, and we've got plenty of safe performance
improvements from the last 30 years of hardware advances.

2020-12-26 20:53:47 +00:00

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