Add caches to lotus-stats and splitcode

[travisperson]

No description provided.

[codecov]

Codecov Report

Merging #7329 (edf3432) into master (e0a9cae) will decrease coverage by 0.11%.
The diff coverage is 3.70%.

❗ Current head edf3432 differs from pull request most recent head 2d4f595. Consider uploading reports for the commit 2d4f595 to get more accurate results

@@            Coverage Diff             @@
##           master    #7329      +/-   ##
==========================================
- Coverage   39.88%   39.77%   -0.12%     
==========================================
  Files         633      634       +1     
  Lines       67098    67184      +86     
==========================================
- Hits        26765    26720      -45     
- Misses      35740    35857     +117     
- Partials     4593     4607      +14     

Impacted Files	Coverage Δ
cmd/lotus-pcr/main.go	0.00% <0.00%> (ø)
tools/stats/influx/influx.go	0.00% <0.00%> (ø)
tools/stats/ipldstore/ipldstore.go	0.00% <0.00%> (ø)
tools/stats/points/collect.go	0.00% <0.00%> (ø)
tools/stats/sync/sync.go	0.00% <0.00%> (ø)
cmd/lotus-stats/main.go	0.86% <1.47%> (+0.86%)	⬆️
tools/stats/headbuffer/head_buffer.go	90.00% <90.00%> (ø)
chain/events/message_cache.go	87.50% <0.00%> (-12.50%)	⬇️
markets/loggers/loggers.go	89.28% <0.00%> (-10.72%)	⬇️
chain/actors/builtin/miner/diff.go	48.52% <0.00%> (-10.30%)	⬇️
... and 17 more

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[arajasek]

I think this is fine as is