Add support for the GCC binary integer constants extension.

From Joerg Wunsch in GCC PR 23479, under the GPLv2.
This is required to build the i965 backend with newer versions of mesa.

ok kettenis@

Add support for the GCC binary integer constants extension.

From Joerg Wunsch in GCC PR 23479, under the GPLv2.
This is required to build the i965 backend with newer versions of mesa.

ok kettenis@ espie@ miod@

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gcc 3.3.5

Import gcc-3.3.2. Only the compiler. ada frontend removed for space
considerations.