[IR] Add verifier for tt.broadcast

[shazqadeer]

Summary: This PR adds a verifier for tt.broadcast primitive to provide early error detection for incorrect usage.

Test Plan: New test

Reviewers: @htyu

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[htyu]

LGTM, thanks for your first commit to Triton!

Can you please retitle the PR to be something like "[IR] Add verifier for tt.broadcast"? Thanks.

[shazqadeer]

@htyu : I don't have write access to be able to merge the PR.