dosisod 2c3077b878 LibJS: Dead code elimination for always truthy/falsey conditions ...

This improves and expands the ability to do dead code elimination on
conditions which are always truthy or falsey.

The following cases are now optimized:
* `if (true){}` -> Only emit `if` block, ignore `else`
* `if (false){}` -> Only emit `else if`/`else` block
* `while (false){}` -> Ignore `while` loop entirely
* `for (x;false;){}` -> Only emit `x` (if it exists), skip `for` block
* Ternary -> Directly return left/right hand side if condition is const

2026-01-31 18:22:40 +01:00

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