[Bug target/96342] [SVE] Add support for "omp declare simd"

[rsandifo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96342

--- Comment #7 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Comment on attachment 49414
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49414
part2-patch

Nice :-)

For the constant_multiple_p calls that calculate a vector multiple,
it might be good to have a macro in poly-int-types.h with the same
definition as vector_element_size, but with a name that more closely
matches its use here.  Maybe "vector_unroll_factor" or something
(suggestions for better names welcome -- I'm not too happy with
my attempt.)