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a6ca20b9a1
This changes the representation of closures in Zir and Sema. Rather than a pair of instructions `closure_capture` and `closure_get`, the system now works as follows: * Each ZIR type declaration (`struct_decl` etc) contains a list of captures in the form of ZIR indices (or, for efficiency, direct references to parent captures). This is an ordered list; indexes into it are used to refer to captured values. * The `extended(closure_get)` ZIR instruction refers to a value in this list via a 16-bit index (limiting this index to 16 bits allows us to store this in `extended`). * `Module.Namespace` has a new field `captures` which contains the list of values captured in a given namespace. This is initialized based on the ZIR capture list whenever a type declaration is analyzed. This change eliminates `CaptureScope` from semantic analysis, which is a nice simplification; but the main motivation here is that this change is a prerequisite for #18816.