numeric_limits

[Richard Henderson <rth at twiddle dot net>]

I think I'm nearly done with the cleanup.

There are three floating point target hooks left:

  __glibcpp_float_has_denorm_loss
  __glibcpp_float_tinyness_before
	I suspect these can be defined to has_denorm == denorm_present.
	I need to survey to see how correct this is.

  __glibcpp_float_traps
	This is true for the overwhelming majority of hardware
	implementations, but is false for most software implementations.
	I guess there's nothing to do but leave it as-is.


Additionally, the config subdirectory could stand to be cleaned
up to remove definitions that are no longer relevant.  In particular,

	__glibcpp_long_bits
	__glibcpp_long_double_bits
	__glibcpp_wchar_t_bits

In most cases, this would completely empty the cpu_limits.h file.
Is it preferred to remove the empty file, or leave the configury
alone for the nonce?


r~