a48197 math: add near half way tests for sqrt and ld80 sqrtl

Authored and Committed by Szabolcs Nagy 4 years ago
    math: add near half way tests for sqrt and ld80 sqrtl
    
    based on "A Test for Correctly Rounded SQRT" by W. Kahan.
    http://people.eecs.berkeley.edu/~wkahan/SQRTest.pdf
    
        
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