[Bug target/80482] [7 Regression] vec_mul produces compilation error if 1 of its parms is const or volatile

[seurer at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80482

--- Comment #1 from seurer at gcc dot gnu.org ---
I see the problem.  The compiler is enforcing "the parameter types must match"
too tightly.  It should be checking the unqualified types (sans const/volatile)
instead of the types directly.