A couple of ir utilities

[gramalingam]

Extracting out some IR utilities from the ongoing fusion draft version, which are useful for debugging and use in other (constant-folding and rewriter) optimizations.

[codecov]

❌ 41 Tests Failed:

Tests completed	Failed	Passed	Skipped
16167	41	16126	3311

View the top 3 failed tests by shortest run time

onnxscript.tools.benchmark.export_model_test.BenchmarkTest::test_export_model_phi_cpu_dynamo

Stack Traces | 0.001s run time

..../test/lib/python3.9.../site-packages/pytest_subtests/plugin.py:112: in _addSkip
    for x, y in self.instance._outcome.errors
E   AttributeError: 'NoneType' object has no attribute 'errors'

onnxscript.tools.transformers_models.mistral_test.TestExportMistral::test_mistral_export_cpu_export_api

Stack Traces | 0.001s run time

..../test/lib/python3.9.../site-packages/pytest_subtests/plugin.py:112: in _addSkip
    for x, y in self.instance._outcome.errors
E   AttributeError: 'NoneType' object has no attribute 'errors'

onnxscript.tools.transformers_models.phi3_test.TestExportPhi3::test_phi3_dort_static

Stack Traces | 0.001s run time

..../test/lib/python3.9.../site-packages/pytest_subtests/plugin.py:112: in _addSkip
    for x, y in self.instance._outcome.errors
E   AttributeError: 'NoneType' object has no attribute 'errors'

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📢 Thoughts on this report? Let us know!

[shubhambhokare1]

Should we add a couple of tests demonstrating this functionality of display_slice?

[shubhambhokare1]

LGTM! nit: Fix lintrunner warnings