[v3] assert consolidation

[Benjamin Kosnik]

Moves __replacement_assert into top-level, uses __builtin_printf,
changes debug and parallel assert macros to use this top-level
definition, and changes atomic asserts to use this if -D_GLIBCXX_DEBUG.

This is the minimal version. At some point after the branch,
_GLIBCXX_PARALLEL_ASSERT and _GLIBCXX_DEBUG_ASSERT can get renamed to
__glibcxx_assert. 

tested x86_64/linux
tested x86_64/linux parallel
tested x86/darwin

-benjamin
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