Different values computed by C2 and interpreter/C1 for Math.pow(x, 2.0) on x86_32

Different values may be computed by C2 and interpreter for Math.pow(x, 2.0) on x86_32.

E.g., for Math.pow(1.0 / 2047, 2.0),
the interpreter would get 2.38651580386563E-7,
         the C2 would get 2.3865158038656307E-7.