Implement optimization pipeline: peephole, constant folding, strength reduction, DCE, tail calls
IR optimizer with 6 composable passes:
- Peephole: PushI32+Drop, Dup+Drop, Swap+Swap, Swap+Drop→Nip, identity ops
- Constant folding: binary (Add/Sub/Mul/And/Or/Xor/shifts/comparisons) + unary (Negate/Abs/Invert/ZeroEq/ZeroLt)
- Strength reduction: power-of-2 multiply→shift, PushI32(0)+Eq→ZeroEq
- Dead code elimination: truncate after Exit, constant-conditional If
- Tail call detection: last Call→TailCall when return stack balanced
- Compound ops: Over+Over→TwoDup, Drop+Drop→TwoDrop with optimized codegen
Dictionary hash index for O(1) word lookup during compilation.
wasmtime config: disable NaN canonicalization, enable module caching.
319 unit tests + 11 compliance, all passing.
ok2
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