Update linalg unary and binary elementwise

[Balint-R]

Rewrote much of the code for our existing linalg elementwise operations.

• Removed making empty tensors for output operands, since a correct implementation of one-shot-bufferize should handle this fine.
• Unary code mostly just got simplified, not much change in functionality.
• Binary operations now accept 2 input arguments and an output argument, similar to MLIR.
  • The element types of the inputs are cast to the element type of the output by MLIR.
  • In the future, we should allow setting output to None and infer something reasonable for it.
• Added tests for all binary linalg ops and fixed existing unary ones.

[jamesthejellyfish]

seems like there was a small copying typo with your _gen_elementwise_binar_macro implementation. Other than that LGTM!

[jamesthejellyfish]

shouldn't this be isinstance(y, Tensor) and isinstance(out, Tensor)?

[Balint-R]

Oops, yes you are correct. I even had a testcase for this, but it throws an error for a different reason. Maybe we should make errors with more specific types rather than throwing TypeError for almost anything...