Rollup of 8 pull requests#85458

Merged

bors merged 24 commits intorust-lang:masterfrom

jackh726:rollup-zvvybmt

May 19, 2021

Commits on May 3, 2021

compiletest: "fix" FileCheck with --allow-unused-prefixes
durin42
committed

Commits on May 13, 2021

Commits on May 14, 2021

bootstrap: build cargo only if requested in tools
infinity0
committed

Commits on May 15, 2021

Change to just use first binders and add test
jackh726
committed

Commits on May 16, 2021

Windows mingw targets use gcc as the linker so the target spec should also indicate linker_is_gnu.
luqmana
committed

Commits on May 19, 2021