Fix crash at exit time: remove ARENA_MAIN from child arena
Fix crash at exit time: remove ARENA_MAIN from child arena

SVN-Revision: 1339

LohithBlaze/drmemory,sigma-random/drmemory,code4bones/drmemory,code4bones/drmemory,LohithBlaze/drmemory,sigma-random/drmemory,sigma-random/drmemory,LohithBlaze/drmemory,LohithBlaze/drmemory,sigma-random/drmemory,code4bones/drmemory,sigma-random/drmemory,code4bones/drmemory,LohithBlaze/drmemory,code4bones/drmemory