Fix sporadic lto test failures.
Fix sporadic lto test failures.

rustyhorde/cargo,eminence/cargo,rustyhorde/cargo,eminence/cargo,nipunn1313/cargo,rustyhorde/cargo,nipunn1313/cargo,rustyhorde/cargo,eminence/cargo,rust-lang/cargo,rust-lang/cargo,eminence/cargo,tsurai/cargo,tshepang/cargo,tsurai/cargo,tsurai/cargo,nipunn1313/cargo,nipunn1313/cargo,tsurai/cargo,tsurai/cargo,rust-lang/cargo,rust-lang/cargo,tshepang/cargo,tshepang/cargo,tshepang/cargo