gallivm: implement new float comparison instructions returning integer masks
gallivm: implement new float comparison instructions returning integer masks

FSEQ/FSGE/FSLT/FSNE work just the same as SEQ/SGE/SLT/SNE except skip the
select.
And just for consistency use the same appropriate ordered/unordered comparisons
for the old opcodes as well.

Reviewed-by: Zack Rusin <6ab0df0692bc027e828ec9e4e9fbe8fa1a7842a8@vmware.com>

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