Short-circuit all for AbstractFill

[jishnub]

This makes the following evaluate at compile time:

julia> @code_typed iszero(Zeros(3,3))
CodeInfo(
1 ─     return true
) => Bool

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (373183f) 99.89% compared to head (5bde556) 99.89%.
Report is 14 commits behind head on master.

❗ Current head 5bde556 differs from pull request most recent head fcabd33. Consider uploading reports for the commit fcabd33 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #329   +/-   ##
=======================================
  Coverage   99.89%   99.89%           
=======================================
  Files           8        8           
  Lines         919      927    +8     
=======================================
+ Hits          918      926    +8     
  Misses          1        1           

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