Do RCEC_GC when approaching the max nr of RCEC, not when reaching it.
Otherwise, long running applications still see the max nr of RCEC
slowly growing, which increases the memory usage and
makes the (fixed) contextTab hash table slower to search.
Without this margin, the max could increase as the GC code
is not called at exactly the moment we reach the previous max,
but rather when a thread has run a bunch of basic blocks.

git-svn-id: svn:// a5019735-40e9-0310-863c-91ae7b9d1cf9
1 file changed