[PATCH, AArch64] Use GCC builtins to count leading/tailing zeros

[Yufeng Zhang]

Hi,

This patch defines a number of macros in stdlib/longlong.h to use GCC 
builtins __builtin_clz* to implement the __clz* and __ctz* functions.

OK for the mainline?

Thanks,
Yufeng


	* stdlib/longlong.h (count_leading_zeros, count_trailing_zeros)
	(COUNT_LEADING_ZEROS_0): Define for aarch64.
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