[mlir][tablegen] getCPPClassName called on a mlir::pdl::OperationType returns unqualified type

[Ralender]

inside tablegen, calling getCPPClassName on a TypeConstraint representing mlir::pdl::OperationType will return the unqualified type OperationType instead of a fully qualified ::mlir::pdl::OperationType

see https://reviews.llvm.org/D132010#inline-1271473 for details.

more generally I think tablegen should emit an error if it cannot figure out a fully qualified type for anything.

[llvmbot]

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