[Bug target/82170] gcc optimizes int range-checking poorly on x86-64

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82170

--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
Note that n==(int)n (gcc documents that this must work) may work with more gcc
versions and is more readable.