[4.6] Fix all() unroll for non-generators/non-list comprehensions (#5360)

[asottile]

No description provided.

[codecov]

Codecov Report

Merging #5361 into 4.6-maintenance will increase coverage by 1.06%.
The diff coverage is 100%.

@@                 Coverage Diff                 @@
##           4.6-maintenance    #5361      +/-   ##
===================================================
+ Coverage            92.87%   93.93%   +1.06%     
===================================================
  Files                  115      115              
  Lines                26391    26399       +8     
  Branches              2607     2606       -1     
===================================================
+ Hits                 24511    24799     +288     
+ Misses                1542     1277     -265     
+ Partials               338      323      -15

Impacted Files	Coverage Δ
src/_pytest/assertion/rewrite.py	95.85% <100%> (+0.79%)	⬆️
testing/test_assertrewrite.py	84.46% <100%> (+0.17%)	⬆️
src/_pytest/main.py	96.06% <0%> (+0.21%)	⬆️
src/_pytest/fixtures.py	97.55% <0%> (+0.27%)	⬆️
testing/test_capture.py	99.25% <0%> (+0.29%)	⬆️
testing/test_config.py	99.82% <0%> (+0.34%)	⬆️
testing/test_pdb.py	98.44% <0%> (+0.38%)	⬆️
src/_pytest/pytester.py	89.83% <0%> (+0.42%)	⬆️
src/_pytest/junitxml.py	95.9% <0%> (+0.58%)	⬆️
... and 16 more

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