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Use the regular code paths for interpreting. Add new instructions: `StartSpeculation` will reset the diagnostics pointers to `nullptr`, which will keep us from reporting any diagnostics during speculation. `EndSpeculation` will undo this. The rest depends on what `Emitter` we use. For `EvalEmitter`, we have no bytecode, so we implement `speculate()` by simply visiting the first argument of `__builtin_constant_p`. If the evaluation fails, we push a `0` on the stack, otherwise a `1`. For `ByteCodeEmitter`, add another instrucion called `BCP`, that interprets all the instructions following it until the next `EndSpeculation` instruction. If any of those instructions fails, we jump to the `EndLabel`, which brings us right before the `EndSpeculation`. We then push the result on the stack.