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5816997ae7
* implement enough of ret_err_value to pass wasm tests
* only do the proper `@panic` implementation for the backends which
support it, which is currently only the C backend. The other backends
will see `@breakpoint(); unreachable;` same as before.
- I plan to do AIR memory layout reworking as a prerequisite to
fixing other backends, because that will help me put all the
constants up front, which will allow the codegen to lower to memory
without jumps.
* `@panic` is implemented using anon decls for the message. Makes it
easier on the backends. Might want to look into re-using decls for
this in the future.
* implement DWARF .debug_info for pointer-like optionals.