compiler_rt: add __ctzsi2, __ctzdi2 and __ctzti2
- structure derived from count0bits.zig
- test cases derived from clzsi2_test.zig and
cross-checked via short helper program
See #1290
f2608df0fbJan Philipp Hafer committed on 12/1/2021, 2:31:16 AM· committed by Andrew Kelleyparent40f5e5d