[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>

0 files changed, 0 insertions, 0 deletions