Fix 'GC_BITMAP_SIZE'
Fix 'GC_BITMAP_SIZE'

Convert 'GC_BITMAP_BYTES' to bits prior to division by 'BITS_PER_LONG'.

Signed-off-by: Jussi Virtanen <2a7e40f91a3be32dfb7e35af6e476a252ebdb4f3@gmail.com>

vpeurala/huron,vpeurala/huron,vpeurala/huron