rs6000.md: Document why a pattern is not available.
* config/rs6000/rs6000.md: Document why a pattern is not available. * config/rs6000/rs6000.c (rs6000_emit_cmove): Disable comparisons of floats on the E500. (branch_positive_comparison_operator): Do not allow NE even on the E500. From-SVN: r80617
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