[Patch][libstdc++-v3] Remove MIPS specific atomicity.h

[David Daney]

In GCC 4.3 we added support for the standard atomic memory builtins to 
the mips target.  This lets us use the generic code in libstdc++ instead 
of the custom asm implementation in config/cpu/mips/atomicity.h

This patch removes config/cpu/mips/atomicity.h, and the config/cpu/mips 
directory which is now empty.  The mips specific host code in 
configure.host is also removed as it doesn't do anything without 
config/cpu/mips/atomicity.h being present.


Bootstrapped and tested on mipsel-linux with no regressions (and zero 
FAILs in libstdc++).

OK to commit?

2008-05-13  David Daney  <ddaney@avtrex.com>

	* config/cpu/mips/atomicity.h: Remove file.
	* config/cpu/mips: Remove directory.
	* configure.host: Remove host specific handling for mips*-*-*.
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