Rollup of 5 pull requests#61799

Merged

bors merged 10 commits intorust-lang:masterfrom

Centril:rollup-vpm5uxr

Jun 13, 2019

Commits on Jun 10, 2019

std: Remove internal definitions of `cfg_if!` macro
alexcrichton
committed

Commits on Jun 12, 2019

Handle index out of bound errors during const eval without panic
estebank
committed

Commits on Jun 13, 2019