Codegen may allocate and then never use slots. Free up those slots
and rewrite bytecode to be smaller. The resulting bytecode will be
slightly faster, result in better inlining, and be somewhat normalized
for further optimizations.
However, we will likely need to gate some of these optimizations
behind a switch as they are beginning to destruct debug info. For
example, local value number maybe should be off by default or at the
very least turned off for named loads.
This does create a lot of warnings, especially in the test suite, but
should improve code and point out real issues.
To disable individual messages, either disable linting, add the metadata :unused to a
binding, or add the prefix "_" to a symbol.
Calvin Rose