[issue43754] Eliminate bindings for partial pattern matches

[Brandt Bucher]

Brandt Bucher <brandtbucher at gmail.com> added the comment:

Since the feature freeze is coming up (and this changes the bytecode), I'd like to open this up for review now.

It probably shouldn't actually be merged before the AST changes in issue 43892, though. There will be quite a few conflicts that need resolving, but I'd rather integrate the AST changes into this PR than force Nick to integrate these deeper changes into his branch.

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