update to DR r1553 for: + DRi#881: drsyms exports support + DRi#879: bump -steal_fds + DRi#880: workaround for drsyms crash
update to DR r1553 for:
+ DRi#881: drsyms exports support
+ DRi#879: bump -steal_fds
+ DRi#880: workaround for drsyms crash



SVN-Revision: 973

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