temporarily disable reification

[vyzo]

big reifications can use a lot of memory during sync apparently.

Temporarily disabling reification until I can sort out the memory usage during sync.

[codecov]

Codecov Report

Merging #8132 (899a65a) into master (72021b3) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #8132      +/-   ##
==========================================
- Coverage   39.36%   39.33%   -0.04%     
==========================================
  Files         666      666              
  Lines       72464    72466       +2     
==========================================
- Hits        28527    28501      -26     
- Misses      39003    39023      +20     
- Partials     4934     4942       +8     

Impacted Files	Coverage Δ
blockstore/splitstore/splitstore_reify.go	50.86% <0.00%> (-0.90%)	⬇️
chain/events/observer.go	71.64% <0.00%> (-6.72%)	⬇️
chain/stmgr/tracers.go	84.21% <0.00%> (-5.27%)	⬇️
chain/exchange/peer_tracker.go	66.66% <0.00%> (-4.31%)	⬇️
miner/warmup.go	70.83% <0.00%> (-4.17%)	⬇️
chain/types/tipset_key.go	85.96% <0.00%> (-3.51%)	⬇️
miner/miner.go	53.11% <0.00%> (-3.28%)	⬇️
storage/wdpost_sched.go	79.41% <0.00%> (-1.97%)	⬇️
chain/store/store.go	63.66% <0.00%> (-1.84%)	⬇️
chain/stmgr/searchwait.go	67.30% <0.00%> (-1.29%)	⬇️
... and 12 more

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[magik6k]

(backport in case we don't get anything better soon)