Due to incorrect vectmask type checking in inline_vector_convert(), vectmask cast operations are not able to inline. Should be:

@@ -2414,8 +2414,8 @@ bool LibraryCallKit::inline_vector_convert() {
   // where certain masks (depending on the species) are either propagated
   // through a vector or predicate register.
   if (is_mask &&
- ((src_type->isa_vect() && dst_type->isa_vectmask()) ||
- (dst_type->isa_vect() && src_type->isa_vectmask()))) {
+ ((src_type->isa_vectmask() == NULL && dst_type->isa_vectmask()) ||
+ (dst_type->isa_vectmask() == NULL && src_type->isa_vectmask()))) {
     return false;
   }