[Patch] libstdc++/21193 (float, double, long double)

[Paolo Carlini]

Hi,

the below are the float/double/long double bits, as per the discussions
with Gaby and Joe: basically, I'm using the approach suggested by Gaby
when safe and resort to frexp for long double (similarly to various
proposals on the web and python).

Tested x86-linux and, lightly, x86-64-linux.

Paolo.

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