Backport #45727 and a patch to make it work #45938
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Currently constrained to `totalmem / ncores / 2` for `_P64` which results in a very short collect interval when you're running with a smaller number of threads on a machine with many cores. Changes this to `totalmem / nthreads / 2` which, for two of our tests, resulted in 40% and 60% runtime reduction (!!) as well as GC time reduction from 46% to 10% and 64% to 11%.
To allow use of `jl_n_threads` in GC initialization.
DilumAluthge
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