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* link: add a virtual function `lowerUnnamedConsts`, similar to `updateFunc` or `updateDecl` which needs to be implemented by the linker backend in order to be used with the `CodeGen` code * elf: implement `lowerUnnamedConsts` specialization where we lower unnamed constants to `.rodata` section. We keep track of the atoms encompassing the lowered unnamed consts in a global table indexed by parent `Decl`. When the `Decl` is updated or destroyed, we clear the unnamed consts referenced within the `Decl`. * macho: implement `lowerUnnamedConsts` specialization where we lower unnamed constants to `__TEXT,__const` section. We keep track of the atoms encompassing the lowered unnamed consts in a global table indexed by parent `Decl`. When the `Decl` is updated or destroyed, we clear the unnamed consts referenced within the `Decl`. * x64: change `MCValue.linker_sym_index` into two `MCValue`s: `.got_load` and `.direct_load`. The former signifies to the emitter that it should emit a GOT load relocation, while the latter that it should emit a direct load (`SIGNED`) relocation. * x64: lower `struct` instantiations