Changes

[OpenMP] Remove omptarget-nvptx from deps as it is no longer a valid target

`omptarget-nvptx` is still a dependence for `check-libomptarget-nvtpx`
although it has been removed by D94573.

Reviewed By: JonChesterfield

Differential Revision: https://reviews.llvm.org/D94725

[mlir][Linalg] Add canonicalization of linalg op -> dim op.

Add canonicalization to replace use of the result of a linalg
operation on tensors in a dim operation, to use one of the operands of
the linalg operations instead. This allows the linalg op itself to be
deleted when all its non-dim uses are removed (say through tiling, etc.)

Differential Revision: https://reviews.llvm.org/D93076

[mlir][Linalg] NFC: Verify tiling on linalg.generic operation on tensors.

With the recent changes to linalg on tensor semantics, the tiling
operations works out-of-the-box for generic operations. Add a test to
verify that and some minor refactoring.

Differential Revision: https://reviews.llvm.org/D93077