make realloc_string explicitely allocate a new string instead of realloc'ing #160
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PR Description
I'm able to build Julia locally with this patch.
Motivation is to fix a race we may have in
gc_big_object_link/unlink
if two different threads mutate a bigval list at the same time.Checklist
Requirements for merging:
port-to-*
labels that don't apply.