[mips] Handle missing CondCodes

Add patterns for unhandled CondCode enumerables:
SETEQ, SETGE, SETGT, SETLE, SETLT, SETNE.

Stated at the ISD::CondCode enum declaration:
`All of these (except for the 'always folded ops')
should be handled for floating point.`

Add patterns which use these nodes, same as corresponding
'ordered' CondCode nodes.

Referring to 'Ordered means that neither operand is a QNAN'
we assume it is safe to match ex. SETLT node to the same
instruction as SETOLT.

Differential Revision: https://reviews.llvm.org/D50757

llvm-svn: 340392