REF: remove unreachable code in core.internals

[jbrockmendel]

@TomAugspurger it looks like _sparse_blockify is never hit. Is that no longer reachable?

[TomAugspurger]

SparseBlock is gone, so sparse_blockify is indeed likely dead.

[codecov]

Codecov Report

Merging #26800 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #26800      +/-   ##
==========================================
+ Coverage   91.73%   91.76%   +0.02%     
==========================================
  Files         178      178              
  Lines       50774    50751      -23     
==========================================
- Hits        46578    46570       -8     
+ Misses       4196     4181      -15

Flag	Coverage Δ
#multiple	90.35% <100%> (+0.03%)	⬆️
#single	41.22% <60%> (-0.06%)	⬇️

Impacted Files	Coverage Δ
pandas/core/internals/managers.py	95.21% <ø> (+1.34%)	⬆️
pandas/core/internals/blocks.py	94.38% <100%> (+0.25%)	⬆️
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	96.88% <0%> (-0.12%)	⬇️
pandas/util/testing.py	90.94% <0%> (+0.1%)	⬆️

---

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[codecov]

Codecov Report

Merging #26800 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #26800      +/-   ##
==========================================
+ Coverage   91.73%   91.76%   +0.02%     
==========================================
  Files         178      178              
  Lines       50774    50751      -23     
==========================================
- Hits        46578    46570       -8     
+ Misses       4196     4181      -15

Flag	Coverage Δ
#multiple	90.35% <100%> (+0.03%)	⬆️
#single	41.22% <60%> (-0.06%)	⬇️

Impacted Files	Coverage Δ
pandas/core/internals/managers.py	95.21% <ø> (+1.34%)	⬆️
pandas/core/internals/blocks.py	94.38% <100%> (+0.25%)	⬆️
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	96.88% <0%> (-0.12%)	⬇️
pandas/util/testing.py	90.94% <0%> (+0.1%)	⬆️

---

Continue to review full report at Codecov.

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 129aaea...331c3a2. Read the comment docs.

[jreback]

thanks @jbrockmendel