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This commit contains everything from the copy-elision-2 branch that does not have to do with copy elision directly, but is generally useful for master branch. * All const values know their parents, when applicable, not just structs and unions. * Null pointers in const values are represented explicitly, rather than as a HardCodedAddr value of 0. * Rename "maybe" to "optional" in various code locations. * Separate DeclVarSrc and DeclVarGen * Separate PtrCastSrc and PtrCastGen * Separate CmpxchgSrc and CmpxchgGen * Represent optional error set as an integer, using the 0 value. In a const value, it uses nullptr. * Introduce type_has_one_possible_value and use it where applicable. * Fix debug builds not setting memory to 0xaa when storing undefined. * Separate the type of a variable from the const value of a variable. * Use copy_const_val where appropriate. * Rearrange structs to pack data more efficiently. * Move test/cases/* to test/behavior/* * Use `std.debug.assertOrPanic` in behavior tests instead of `std.debug.assert`. * Fix outdated slice syntax in docs.