Update MLIR (again)

[seibert]

PR for upgrades to MLIR 14.0 pre-release (d51e347). To install conda package of this MLIR release:

conda install 'metagraph/label/mlir14_test::mlir=14=*_10'

[coveralls]

Pull Request Test Coverage Report for Build 1691063004

• 4 of 4 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 85.889%

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Totals
Change from base Build 1594078109:	0.0%
Covered Lines:	4559
Relevant Lines:	5308

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💛 - Coveralls

[seibert]

Changes required:

• Add environment prefix to CMAKE_PREFIX_PATH. This ensures that libraries installed in the conda environment are discovered (which is very useful when working with x86 packages on macOS M1 system). New MLIR cmake scripts seem to be explicitly searching for terminfo libraries that are not found unless this is added.
• WhileOp accessors for before and after regions have been renamed from before() and after() to getBefore() and getAfter().
• memref.tensor_load -> bufferization.to_tensor
• linalg.tensor_expand_shape -> tensor.expand_shape
• linalg.tensor_collapse_shape -> tensor.collapse_shape

[seibert]

going to merge this now. Still to do in subsequent PRs:

• Update notebooks that reference operations that have moved dialects
• Update the SparseUtils.cpp file to reflect the new upstream version