[Bug #19038] Fix corruption of generic_iv_tbl when compacting

	When the generic_iv_tbl is resized up, rebuild_table performs
	allocations that can trigger GC. If autocompaction is enabled, then
	moved objects are removed from and inserted into the generic_iv_tbl.
	This may cause another call to rebuild_table to resize the
	generic_iv_tbl. When returning back to the original rebuild_table, some
	of the data may be stale, causing the generic_iv_tbl to be corrupted.

	This commit changes rebuild_table to only read data from the st_table
	after the allocations have completed.

Co-Authored-By: Matt Valentine-House <matt@eightbitraptor.com>
	---
	 st.c | 15 ++++++++++-----
	 1 file changed, 10 insertions(+), 5 deletions(-)