[cfe-dev] precise double rewrite patch

[Olaf Krzikalla]

Hi @clang,

the attached patch increases the precision of the FloatingLiteral 
rewrite significantly. With the patch sometimes the output is no longer 
"pretty". However it is always precise. Before the change I had serious 
trouble with rounding errors.
I hope the proposed approach is considered better than the old one. Of 
course it might be possible to make it sometimes much prettier while not 
loosing too much precision but I'm not sure how exactly (what is the 
definition of "loosing too much precision") and whether it is worth the 
effort.

Best regards
Olaf Krzikalla
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