MFC r206973:
MFC r206973:

When CPUTYPE is defined to any value, on amd64 platform "mmx" is
available through MACHINE_CPU, indicating the CPU supports that
feature, as done by revision 138685.

This changeset adds "mmx" into the default amd64 MACHINE_CPU list
when no CPUTYPE is specified to provide consistent behavior.

PR:		amd64/145593
Submitted by:	mm

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase