[Bug 126] Add support for attribute to mark data as volatile.

[bearophile via D.gnu]

Iain Buclaw:

> http://bugzilla.gdcproject.org/show_bug.cgi?id=126

The D1 deprecation warning to replace volatile with synchronized:

https://github.com/D-Programming-Language/dmd/commit/c8d580aea687f16b56ff4ce935f618b41a74c6e7

Bye,
bearophile