Deterministic printing of IR values

[vaivaswatha]

Closes #4517

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Note

Make IR printing deterministic by deriving stable SSA names and emitting constants separately; normalize metadata/operand printing, remove inlined folded instructions, and update tests and snapshots accordingly.

• Printer determinism and naming: Reworked sway-ir/src/printer.rs to make SSA value names deterministic by deriving Namer::default_name() from slotmap::Key::data() (e.g., v<idx>v<gen>), and introduced maybe_constant_to_doc to emit constant definitions once and refer to them by stable IDs. Adjusted instruction printing to emit constant definitions separately and to reference them via generated IDs, improving reproducibility.
• Constant folding output: combine_cmp now replaces folded compare instructions with a standalone constant and removes the original instruction; tests updated to match const <ty> <value> and to use $ID/$VAR regex placeholders rather than brittle v0 literals.
• Metadata printing normalization: Simplified Metadatum textual format (e.g., !1 = !0, a_struct …, (… …)), ensuring stable, concise output; MetadataNamer now assigns deterministic indices.
• Test updates and golden outputs: Updated numerous IR/CSE/DCE/inline/serialize tests to use regex placeholders (e.g., regex: VAR=v\d+v\d+, $ID = …, $VAR reuse) and to expect separate constant definitions and stable value IDs. Regenerated E2E snapshots (e.g., array_repeat, logging, transmute, main_args) reflecting new deterministic naming.
• Minor cleanups: Tweaked constants.rs test expectations; adjusted get_storage_key and store/load prints to reference $VAR placeholders; added slotmap::Key import.

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