re PR bootstrap/39454 (Bootstrap failure on sparcv9-linux with profiledbootstrap)
PR bootstrap/39454
* cse.c (fold_rtx): Don't modify original const_arg1 when
canonicalizing SHIFT_COUNT_TRUNCATED shift count, do it on a
separate variable instead.
* rtlanal.c (nonzero_bits1) <case ASHIFTRT>: Don't assume anything
from out of range shift counts.
(num_sign_bit_copies1) <case ASHIFTRT, case ASHIFT>: Similarly.