[mlir][python] Add location source composition to loc_tracebacks() (#192310) ## Summary Add two new kwargs to `loc_tracebacks()` controlling how the three location sources (explicit `loc=`, traceback, `Location.current`) compose: - **`on_explicit`**: `OnExplicitAction.USE_EXPLICIT` (default) | `OnExplicitAction.USE_TRACEBACK` — what to do when explicit `loc=` is passed - **`current_loc`**: `CurrentLocAction.FALLBACK` (default) | `CurrentLocAction.NAMELOC_WRAP` — how to compose `Location.current` NameLoc scopes on top Both enums are exposed to Python via `nb::enum_<>` bindings, following the `PassDisplayMode` pattern in `Pass.cpp`. The two flags are orthogonal and only take effect when `loc_tracebacks()` is active. ## Use cases 1. **DSL profiling attribution**: `loc_tracebacks(current_loc=CurrentLocAction.NAMELOC_WRAP, on_explicit=OnExplicitAction.USE_TRACEBACK)` — push NameLoc scopes for profiling and have them survive traceback generation 2. **Override explicit locs with tracebacks**: `loc_tracebacks(on_explicit=OnExplicitAction.USE_TRACEBACK)` — get full Python stack traces without removing every `loc=` argument ## Test plan - [x] All 102 existing Python binding tests pass (5 unsupported unchanged) - [x] 6 new tests covering: nameloc_wrap, on_explicit default, on_explicit=use_traceback, DSL profiling combo, orthogonality (use_explicit + nameloc_wrap), tracebacks-disabled fallback Co-authored by Claude Code ;) --------- Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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