Revert "std.fmt.format: small optimization to avoid runtime bloat"
This reverts commit 11d38a7e520f485206b7b010f64127d864194e4c.
The benefits of this commit are not enough to justify the compromise
that it made.
closes #5977
a2bb246db4Andrew Kelley committed on 8/5/2020, 8:30:43 PMparentc4b9f5e