[mlir] Defer `LoopLikeOpInterface` type checks to `RegionBranchOpInterface` (#184116) `LoopLikeOpInterface`'s verifier hardcodes type equality checks for init/iter_arg/yield/result edges. This prevents downstream ops with compatible-but-unequal types from using the pass verifier, since there is no override mechanism. `RegionBranchOpInterface` already verifies types along all control-flow edges and provides an overridable `areTypesCompatible` hook. In practice, most loop ops implement both interfaces, making the `LoopLikeOpInterface` type checks redundant (the existing code even had a comment acknowledging this). This PR removes the redundant type checks from `LoopLikeOpInterface` when the op also implements `RegionBranchOpInterface`, letting that interface handle type compatibility (including any custom `areTypesCompatible` overrides). For ops that only implement `LoopLikeOpInterface` (e.g. `affine.parallel`, `tosa.while_loop`), the strict type equality checks are retained as a fallback. the verifier's loop-result check to use structured bindings with `llvm::enumerate` and remove dead variables.
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