Apply Akio Idehara's fix for FS#7972 - Fix ARM's swp (xchg) inline assembly for gcc 4.2. Also avoids UNPREDICTABLE behavior that GCC should have always warned about.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15157 a1c6a512-1295-4272-9138-f99709370657
1 file changed