[PATCH, i386, PR53877] New intrinsics for LZCNT

[Kirill Yukhin]

Hello guys,

Here is a tiny patch which adds two new intrinsics which were
introduced in recent spec [1].
They're aliased to the existing __lzcnt_*  and live under same CPUID.

ChangeLog entry is:
2012-07-16  Kirill Yukhin  <kirill.yukhin@intel.com>

        PR target/53877
        * config/i386/lzcntintrin.h (_lzcnt_u32): New.
        (_lzcnt_u64): Ditto.

Is it OK for trunk?

[1] --  http://software.intel.com/file/45088

Thanks, K
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