[PATCH] Code cleanup in <locale>

[Marshall Clow]

While looking into http://llvm.org/bugs/show_bug.cgi?id=17782, I noticed that there was a chunk of code in <locale> for dealing with floating point numbers.
This code was duplicated three times, once for float, double, and long double.  Hoist this into a template, and make the original call sites use the template.

No functionality change intended.

-- Marshall

Marshall Clow     Idio Software   <mailto:mclow.lists at gmail.com>

A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait).
        -- Yu Suzuki
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