Fix scheduling for mixed precision

[chhwang]

Consider uop arguments types for identifying duplicated definitions

[codecov]

Codecov Report

Merging #134 (78fcc64) into main (008cae1) will increase coverage by 0.03%.
The diff coverage is 62.50%.

❗ Current head 78fcc64 differs from pull request most recent head 6269d72. Consider uploading reports for the commit 6269d72 to get more accurate results

@@            Coverage Diff             @@
##             main     #134      +/-   ##
==========================================
+ Coverage   73.49%   73.53%   +0.03%     
==========================================
  Files          82       82              
  Lines        6508     6529      +21     
==========================================
+ Hits         4783     4801      +18     
- Misses       1725     1728       +3     

Files	Coverage Δ
ark/sched/sched/sched_default.cc	78.00% <100.00%> (+0.68%)	⬆️
ark/sched/sched_codegen.cc	71.22% <100.00%> (ø)
ark/sched/sched_op.h	100.00% <ø> (ø)
ark/sched/sched_op.cc	76.19% <57.14%> (-6.35%)	⬇️

... and 2 files with indirect coverage changes