[PATCH, libphobos] Committed IEEE quadruple support to core.internal.convert

[Iain Buclaw]

This patch is backported from druntime 2.083, primarily for beginning
to finish off AArch64 library support, but should apply to any targets
that use 128-bit IEEE long doubles.  Bootstrapped and ran D2 testsuite
on x86_64-linux-gnu.

Commited to trunk as r266222.

-- 
Iain
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