Function flatten

src/resource/unit_compiler.cpp:1256–1277

	}

	s32 flatten(UnitCompiler &c, CompileOptions &opts)
	{
		auto cur = hash_map::begin(c._units);
		auto end = hash_map::end(c._units);
		for (; cur != end; ++cur) {
			HASH_MAP_SKIP_HOLE(c._units, cur);

			s32 err = assign_unit_indices(c, cur->second, UINT32_MAX, opts);
			ENSURE_OR_RETURN(UNIT_COMPILER, err == 0, opts);
		}

		cur = hash_map::begin(c._units);
		end = hash_map::end(c._units);
		for (; cur != end; ++cur) {
			HASH_MAP_SKIP_HOLE(c._units, cur);

			s32 err = flatten_unit(c, cur->second, UINT32_MAX, opts);
			ENSURE_OR_RETURN(UNIT_COMPILER, err == 0, opts);
		}

		return 0;
	}

	s32 blob(Buffer &output, UnitCompiler &c)
	{