Profiling improvements

[seibert]

• Better detection of graphblas-opt in source tree
• Handle apply_passes with filename (as done in profiling) when calling debug_passes after compilation error
• Avoid "unknown" location in code generation, or debug information will not be emitted when translating to LLVM IR

[coveralls]

Pull Request Test Coverage Report for Build 1262626588

• 84 of 90 (93.33%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.1%) to 83.465%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
mlir_graphblas/cli.py	7	9	77.78%
mlir_graphblas/algorithms.py	77	81	95.06%
<!--	Total:	84	90	93.33%	-->

Files with Coverage Reduction	New Missed Lines	%
mlir_graphblas/cli.py	1	58.39%
<!--	Total:	1		-->

Totals
Change from base Build 1260119680:	-0.1%
Covered Lines:	2842
Relevant Lines:	3405

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💛 - Coveralls