Revert "Remove first_thread/crtn static variables"

Issue #536 (bdwgc).

This reverts commit 92dce071fa2db2b615981818b1db1024558d09ca.

Reason: there should be no objects allocation in GC_init (because
static data root are registered later in GC_init on Darwin, and because
the client might call GC_enable_incremental after GC_init and in case
of GWW_VDB any object allocation should be generally avoided before
GC_enable_incremental is called).  Thus, we need the first entry in
GC_threads table to be allocated statically.

0 files changed, 0 insertions, 0 deletions