This is the final preparatory PR for top-of-stack caching

This PR:

• Removes the stack manipulation macros. Instructions must declare values as dead, and let the code generator pop them from the stack
• Updates the instrumented instructions to be explicit about their stack effect
• Supports mixing of scalars and arrays on the stack. The code generator pushes scalars to memory if needed for an array.

• Issue: Top-of-stack caching in the interpreter #131498