ivmai / bdwgc / 1402

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Fix data race in GC_heapsize_at_forced_unmap variable

Issue #488 (bdwgc).

Write to GC_heapsize_at_forced_unmap should be only performed when
holding the allocation lock.

* alloc.c (GC_heapsize_at_forced_unmap): Move the definition upper to
be before GC_try_to_collect_general(); add comment.
* alloc.c (GC_try_to_collect_general): Set GC_heapsize_at_forced_unmap
value (after LOCK) if force_unmap; move comment from
GC_heapsize_at_forced_unmap().
* alloc.c [!USE_MUNMAP] (GC_try_to_collect_general): Remove
UNUSED_ARG(force_unmap).
* alloc.c (GC_gcollect_and_unmap): Do not set
GC_heapsize_at_forced_unmap.

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7446 of 10032 relevant lines covered (74.22%)

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