Support foldxl etc.

[tkf]

No description provided.

[codecov]

Codecov Report

Merging #145 into master will decrease coverage by 0.13%.
The diff coverage is 92.30%.

@@            Coverage Diff             @@
##           master     #145      +/-   ##
==========================================
- Coverage   78.88%   78.74%   -0.14%     
==========================================
  Files           8        9       +1     
  Lines         412      414       +2     
==========================================
+ Hits          325      326       +1     
- Misses         87       88       +1     

Impacted Files	Coverage Δ
src/ThreadsX.jl	50.00% <50.00%> (ø)
src/foreach.jl	81.81% <100.00%> (ø)
src/reduce.jl	98.41% <100.00%> (ø)

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