patch to fix rtl documentation for new floating point comparisons

[Kenneth Zadeck]

Before I commit this, or do the corresponding tree level patch, I would 
like this to be looked at by the FP people.   I am guessing at some of 
this, other parts i gleaned from various standards docs and an irc 
conversation with Joseph.   This should have been documented when it was 
put into the compiler.  This is certainly not obvious.


Kenny
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