Use non-zero value for GC trace flags. Fix a GC trace collection bug which is at least 2 year old.
Use non-zero value for GC trace flags. Fix a GC trace collection bug which is at least 2 year old.

Short explanation (flags & GC_trace_stack_FLAG) always produce FALSE if GC_trace_stack_FLAG is zero.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@47378 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot