Conversion from&to float<->integer (32&64 bits) #139

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ithinuel wants to merge 4 commits intorust-lang:masterfrom

ithinuel:conv_from_llvm

Commits on Dec 6, 2016

impl (unsigned/signed) int to single/double precision float conversion based on llvm algorithms.
ithinuel
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Commits on Feb 5, 2017

Commits on Feb 6, 2017

exclude from tests values out of integer range (and NaN).
ithinuel
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