ivmai / bdwgc / 1506

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Fix GC_excl_table overrun on overflow in GC_exclude_static_roots

Previously, in case of full GC_excl_table[], an attempt to insert an
element to it caused write past end of GC_excl_table (when shifting the
tail elements) before aborting cause of the table overflow.

* mark_rts.c (GC_exclude_static_roots_inner): Move check of
GC_excl_table_entries upper to be before first access to GC_excl_table;
move i local variable down to be near place of usage; cast result of
next-GC_excl_table to size_t.

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