[patch] Lazily provide a __float128 type in -std=gnu++11 mode

[Nico Weber]

Hi,

the attached patch lazily inserts a __float128 type the first time one is
looked up. This is needed to compile libstdc++4.7+ headers in -std=gnu++11
mode. This fixes PR13530, see that bug for more information.

Ok?

Nico
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