[PATCH][X86] __builtin_ctz/clz sometimed defined for zero input

[Robinson, Paul]

New patch attached that defines new builtins and uses them in lzcntintrin.h.  This patch doesn't change anything about the behavior of the old builtins (although they come along for the ride when I refactored the CGBuiltins.cpp implementation).  I also tightened up the test for the lzcntintrin.h functions, as it didn't notice the incorrect translation.
Yeah I know I should have a doc update as well; I'll get to it, but I have to leave right now.
--paulr

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