Treat 0 as special value for codegen-units-std
Treat 0 as special value for codegen-units-std

Fixes #57669

graydon/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust