Optimize Iterable instances implementation.

[takayahilton]

No description provided.

[codecov-io]

Codecov Report

Merging #3174 into master will increase coverage by 0.35%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3174      +/-   ##
==========================================
+ Coverage   92.99%   93.34%   +0.35%     
==========================================
  Files         376      372       -4     
  Lines        7381     7203     -178     
  Branches      195      187       -8     
==========================================
- Hits         6864     6724     -140     
+ Misses        517      479      -38

Flag	Coverage Δ
#scala_version_212	93.34% <100%> (+0.02%)	⬆️
#scala_version_213	?

Impacted Files	Coverage Δ
...s-core/src/main/scala/alleycats/std/iterable.scala	100% <100%> (+25%)	⬆️
...in/scala/cats/data/AbstractNonEmptyInstances.scala	96.55% <0%> (-3.45%)	⬇️
...e/src/main/scala-2.13+/cats/data/ZipLazyList.scala
...src/main/scala-2.13+/cats/instances/lazyList.scala
....13+/cats/kernel/instances/LazyListInstances.scala
.../main/scala-2.13+/cats/data/NonEmptyLazyList.scala

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[kailuowang]

Thanks