Horiz fuse after pointwise

[CharlieL7]

Updates find_splits matcher:

• Skip trying to fuse instructions that have inter-group dependencies (where a split group depends on another such as the case sigmoid(x) + x
• Allow fusing pointwise instructions that are identical. Currently comparing using string-ified modules.
• Fixed a bug with dependencies within a group not being detected.

Before this PR in yolox: After this PR:

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 97.61905% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/fuse_pointwise_reduce.cpp	0.00%	1 Missing :warning:

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3920   +/-   ##
========================================
  Coverage    92.41%   92.41%           
========================================
  Files          522      522           
  Lines        22532    22555   +23     
========================================
+ Hits         20822    20844   +22     
- Misses        1710     1711    +1     

Files with missing lines	Coverage Δ
src/simplify_algebra.cpp	98.26% <100.00%> (+0.04%)	:arrow_up:
src/fuse_pointwise_reduce.cpp	0.00% <0.00%> (ø)

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[pfultz2]

Unit tests need to be added for fusing the pointwise modules. You will need to add a test suite for the fuse_pointwise_reduce pass and add a test there.

The is_dependent needs to use the distance to avoid traversing the whole graph. The is_dependent function is equivalent to the reaches function from #3870 here. It doesnt avoid traversing the whole graph there, but that will be needed to fix the timeouts in bert, so there is some overlap here.

This really shouldn't have been merged yet as the performance report hasn't even run on this, and there could be timeouts in the compile with this change as well, similar to #3870.

[CharlieL7]

Unit tests need to be added for fusing the pointwise modules. You will need to add a test suite for the fuse_pointwise_reduce pass and add a test there.

Running fuse_pointwise in one of the simplify_algebra tests. Any difference with moving to fuse_pointwise_reduce?

[pfultz2]

Running fuse_pointwise in one of the simplify_algebra tests. Any difference with moving to fuse_pointwise_reduce?

Sorry I missed, that should be fine in the simplify_algebra tests.