Rollup of 8 pull requests#63583

Closed

Centril wants to merge 24 commits intorust-lang:masterfrom

Centril:rollup-5s17x9k

Commits on Jul 31, 2019

Commits on Aug 5, 2019

review feedback: find lib root path from registry
mfkl
committed

Commits on Aug 8, 2019

move store lib probing code to librustc_codegen_ssa
mfkl
committed

Commits on Aug 10, 2019

rustc_target: add n64 musl targets for MIPS64 arches
xen0n
committed

Commits on Aug 13, 2019

Commits on Aug 14, 2019

Commits on Aug 15, 2019