Experiment with some static evalution#2153
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- Add fuel counter (1000) to prevent divergence on cyclic CFG. - Gate debug eprintf calls behind Debug.find "static-eval". - Inner Apply: build callee env from Var.Map.empty so caller locals don't leak into the callee body. - Cond: replace `assert false` (would crash on unexpected operand) with fall-through to `None`; drop spurious `Tuple` arm. - caml_obj_dup / Constant cases: add Float32 and Null_ to the immediate-constant set.
Match the kinds already used by the JS backend in compiler/lib/generate.ml:
- Pure: caml_alloc_dummy{,_float,_mixed}, caml_js_{to_int32,to_nativeint,
from_bool,to_bool}
- Mutable: caml_array_unsafe_get, caml_js_{,strict_}equals
A returned Tuple/Float_array constant would lose the array_or_not and
field-type information the back-end needs (notably for float records),
miscompiling e.g. let f x = { x; y = 2. } -> f 1.. Keep the original
Apply in that case.
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