Lazy locals dict for NEWLOCALS frames by youknowone · Pull Request #7307 · RustPython/RustPython

Defer locals dict allocation for function frames until first access.
Most function frames only use fastlocals and never touch the locals
dict, so this skips one dict heap allocation per function call.

Also remove a redundant code.clone() in invoke_with_locals.

Func call ~23% faster, method call ~15% faster in benchmarks.