Rollup of 12 pull requests#65382

Closed

Centril wants to merge 33 commits intorust-lang:masterfrom

Centril:rollup-jc14sl3

Commits on Oct 8, 2019

Split non-CAS atomic support off into target_has_atomic_load_store
Amanieu
committed

Commits on Oct 10, 2019

Commits on Oct 11, 2019

improve performance of signed saturating_mul
tspiteri
committed

Commits on Oct 13, 2019