8039743: Use correct format specifier to print size_t values and pointers in the GC code
Reviewed-by: jmasa, sjohanss
Contributed-by: stefan.karlsson@oracle.com, mikael.vidstedt@oracle.com
8041351: Crash in src/share/vm/opto/loopnode.cpp:3215 - assert(!had_error) failed: bad dominance
Summary: add missing is_mem() check when we collect load nodes in SuperWord::co_locate_pack().
Reviewed-by: iveresov