When strtof/d/ld return a subnormal number they may set errno to
ERANGE. This change makes this behavior more consistent by making any
decimal number converting to a subnormal set errno to ERANGE. This
brings it in line with hexadecimals, which currently only set errno to
ERANGE if the number is truncated when converting to a subnormal.
Reviewed By: sivachandra, lntue
Differential Revision: https://reviews.llvm.org/D113626
4cdf9884b6