This reverts commit 36bb2824a6.
Although this was faster on my M3 MacBook Pro, other Apple machines
disagree, including our benchmark runner. So let's revert it.
This is a simple trick to generate better native code for access to
registers, locals, and constants. Before this change, each access had
to first dereference the member pointer in Interpreter, and then get to
the values. Now we always have a pointer directly to the values on hand.
Here's how it looks:
class StackFrame {
public:
Value get(Operand) const;
void set(Operand, Value);
private:
Value m_values[];
};
And we just place one of these as a window on top of the execution
context's array of values (registers, locals, and constants).
Instead of returning internal generator results as ordinary JS::Objects
with properties, we now use GeneratorResult and CompletionCell which
both inherit from Cell directly and allow efficient access to state.
1.59x speedup on JetStream3/lazy-collections.js :^)
