[Bug target/78818] msp430 persistent attribute is not applied correctly in some cases

[awygle at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78818

--- Comment #1 from Andrew Wygle <awygle at gmail dot com> ---
Compiling with -mdata-region=either also causes this problem, with variables
ending up in either .either.data or .either.bss.