[mlir][GPU] Refactor, improve constant size information handling (#186907) 1. There was duplicate code between the integer range analysis's handling of static dimension size information (ex. gpu.known_block_dim attributes) and the handling during the lowering of those operations. The code from integer range analysis was given a dialect-wide entry point (and had its types fixed to be more accurate), which the lowering templates now call. 2. The templated lowering for block/grid/cluster_dim now produces precise ranges (indicating the constant value) where one is known, and the lowerings in rocdl (including those for subgroup_id) have been fixed appropriately. 3. While I was here, the gpu.dimension enum has been moved to GPUBase so it lives next to the other enums. 4. The pattern that expands subgroup_id operations now adds any thread dimension bounds it finds in context. (Claude was used for an initial round of review, I did the main coding myself.) --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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