Rollup of 8 pull requests#81620

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JohnTitor wants to merge 27 commits intorust-lang:masterfrom

JohnTitor:rollup-ouo36rj

Commits on Jan 25, 2021

Improve `rustc_mir_build::matches` docs
camelid
committed

Commits on Jan 27, 2021

Add big-endian support for AArch64 va_arg

Amanieu d'Antras
authored and
Amanieu
committed
Fix ARM and AArch64 calling convention for passing small composite types

Amanieu d'Antras
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Amanieu
committed
Support AArch64 ILP32 in libunwind bindings

Amanieu d'Antras
authored and
Amanieu
committed
Support AArch64 big-endian and ILP32 in compiletest

Amanieu d'Antras
authored and
Amanieu
committed
Add big-endian and ILP32 AArch64 targets

Amanieu d'Antras
authored and
Amanieu
committed
Add new aarch64 targets to platform-support.md

Amanieu d'Antras
authored and
Amanieu
committed
Bump LLVM submodule

Amanieu d'Antras
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Amanieu
committed
Upgrade libc to 0.2.83

Amanieu d'Antras
authored and
Amanieu
committed

Commits on Jan 28, 2021

Rename NLL* to Nll* accordingly to C-CASE
hkmatsumoto
committed

Commits on Jan 29, 2021

Fix invalid camel case suggestion involving unicode idents
estebank
committed

Commits on Feb 1, 2021