[Operations] Change naming of operands and results to be declarative #577
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While MLIR has named operands and results internally, these values are not accessible as strings. However, to print RTL from our IRs, it is required to access the names of these operands and result programmatically.
Previously, this was done using 3 or 4 different structures, and changes to the code base meant some were in fact wrong. With this PR, every operation must declare how to name its operand and results in its tablegen entry. For complex naming, like the LSQ, the tablegen file points to custom functions in HandshakeOps.cpp