linux-user: Track shm regions with an interval tree

Remove the fixed size shm_regions[] array.
Remove references when other mappings completely remove
or replace a region.

Tested-by: Helge Deller <deller@gmx.de>
Reviewed-by: Helge Deller <deller@gmx.de>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
1 file changed