compiler_rt: add __clzdi2 and __clzti2
- structure derived from shift.zig
- rename clzsi2.zig to count0bits.zig
- test cases derived from clzsi2_test.zig
See #1290
81e2034d4aJan Philipp Hafer committed on 9/1/2021, 8:15:21 PM· committed by Andrew Kelleyparent04b8016