new builtins

[Ulrich Drepper]

If I read this

  builtin_function ("__builtin_bzero", bzero_ftype,
		    BUILT_IN_BZERO, BUILT_IN_NORMAL, "bzero");
  builtin_function ("__builtin_bcmp", bcmp_ftype,
		    BUILT_IN_BCMP, BUILT_IN_NORMAL, "bcmp");

code in c-common.c correct `bzero´ and `bcmp´ are now recognized when
optimizing and appropriately expanded.

But this is wrong!  This is OK for the other functions but those names
and the semantic are fixed by the ISO C standard while the above two
functions are only standardized in the Unix standard.

Unless gcc is now intended to be a Unix compiler only these
definitions should be changed and only the __builtin_* name should be
recognized.

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