COMPAT: 32-bit indexing compat

[jreback]

xref #20939

[codecov]

Codecov Report

Merging #20977 into master will decrease coverage by <.01%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master   #20977      +/-   ##
==========================================
- Coverage   91.82%   91.82%   -0.01%     
==========================================
  Files         153      153              
  Lines       49490    49490              
==========================================
- Hits        45445    45443       -2     
- Misses       4045     4047       +2

Flag	Coverage Δ
#multiple	90.22% <50%> (-0.01%)	⬇️
#single	41.85% <0%> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/core/indexing.py	93.55% <50%> (ø)	⬆️
pandas/util/testing.py	84.38% <0%> (-0.21%)	⬇️

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