Add helper for specializing parametric functions

[lsrcz]

This pull request adds a helper for specializing a parametric function with a given environment. The resulting function will be inserted back to the source module.

The C API exposed a "batched" specializing helper that takes an typechecked module and return a cloned typechecked module with all specialized functions inserted. This is needed as our current use of C APIs is assuming that a module is immutable.

[proppy]

could this potentially also be used to add a flag to ir_converter_main that specialize a parametric function?

[lsrcz]

could this potentially also be used to add a flag to ir_converter_main that specialize a parametric function?

@proppy yeah, are you thinking about using a parametric function as the top function, and specialize with some parameters?

[lsrcz]

This PR is now blocked by #3061 as the test suite is referring to functions defined there

[proppy]

@proppy yeah, are you thinking about using a parametric function as the top function, and specialize with some parameters?

👍 yes, this can easily be done w/ a wrapper function today, but is cumbersome to do w/o code generation when you want to instanciate a lot of function variants w/ different sizes.

/cc @richmckeever

[proppy]

This PR is now blocked by #3061 as the test suite is referring to functions defined there

Understood! Let's get #3061 in first.

[lsrcz]

👍 yes, this can easily be done w/ a wrapper function today, but is cumbersome to do w/o code generation when you want to instanciate a lot of function variants w/ different sizes.

Yeah. I used to do code generation to serve my purpose, but replacing all the invocation sites is hard to do without a programmatic way to manipulate the DSLX.