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libgo patch committed: Fix math.Ldexp for large powers


The libgo implementation of math.Ldexp declared the libc "ldexp" as
taking an 'int' exponent argument, which is not quite right for 64-bit
platforms (exp arg is always int32); this could yield incorrect
results for exponent values outside the range of Minint32/Maxint32.
This patch by Than McIntosh fixes this by upating the type for the
libc version of ldexp, and adding guards to screen for out-of-range
exponents.  This fixes https://golang.org/issue/21323.  Bootstrapped
and ran Go tests on x86_64-pc-linux-gnu.  Committed to mainline.

Ian

Attachment: patch.txt
Description: Text document


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