[mlir][scf] Add parallelLoopUnrollByFactors() (#163806) - In the SCF Utils, add the `parallelLoopUnrollByFactors()` function to unroll scf::ParallelOp loops according to the specified unroll factors - Add a test pass "TestParallelLoopUnrolling" and the related LIT test - Expose `mlir::parallelLoopUnrollByFactors()`, `mlir::generateUnrolledLoop()`, and `mlir::scf::computeUbMinusLb()` functions in the mlir/Dialect/SCF/Utils/Utils.h header to make them available to other passes. - In `mlir::generateUnrolledLoop()`, add also an optional `IRMapping *clonedToSrcOpsMap` argument to map the new cloned operations to their original ones. In the function body, change the default `AnnotateFn` type to `static const` to silence potential warnings about dangling references when a function_ref is assigned to a variable with automatic storage. Signed-off-by: Fabrizio Indirli <Fabrizio.Indirli@arm.com>
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