Cleanup: improve invocation codegen #540
Merged
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Previously there was a lot of logic involved in the compiler when performing codegen for invocation expressions, particularly in the case of invoking an expression value (aka, a function value). This change abstracts that complex logic out into a generated
#call
method for the adhoc "Function" structs, and it also cleans it up a bunch too. Additionally, the logic in the main codegen function for invocation expressions gets significantly cleaner.