compiler_rt: Fix clzsi2 implementation for Thumb1

The LUT contains the number of bits set, not the number of leading zeros
as we're subtracting from the total number of bits in a word.

Closes #4415
c4d0f97b4cLemonBoy committed on 2/9/2020, 7:12:01 PM· committed by Andrew Kelleyparentb55bc5e
1 file changedLine totals unavailable