Remove obsolete .hgeol entry pointing to file moved elsewhere.
This kine was already replaced by
Lib/test/test_email/data/msg_26.txt = BIN
which is just below the last line in the patch context.
Merge with 3.3
Close #18745: Improve enum tests in test_json for infinities and NaN.
Instead of XORed indicies, switch to a hybrid of linear probing and open addressing.

Modern processors tend to make consecutive memory accesses cheaper than
random probes into memory.

Small sets can fit into L1 cache, so they get less benefit.  But they do
come out ahead because the consecutive probes don't probe the same key
more than once and because the randomization step occurs less frequently
(or not at all).

For the open addressing step, putting the perturb shift before the index
calculation gets the upper bits into play sooner.
Refactor the main function of regrtest a bit.

Moving subprocess execution of tests into a function.