[Bug target/61563] better 387 code for float x == (int)x

[jay.foad at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61563

--- Comment #2 from Jay Foad <jay.foad at gmail dot com> ---
I hadn't considered spurious "invalid" exceptions. I was only thinking about
the result of the whole expression, which I think is the same regardless of
rounding mode even for double and int.