This pulls in a fix for the install script on some tr(1) implementations,
as well as an update to use `anyhow` instead of `failure` for error
handling.

Keep congruency with other parts, full word vector is rarely used.

When cross-compiling, the LLVM build system recurses to build tools
that need to run on the host system. However, since we pass cmake defines
to set the compiler and target, LLVM still compiles these tools for the
target system, rather than the host. The tools then fail to execute
during the LLVM build.

This change sets defines for the tools that need to run on the
host (llvm-nm, llvm-tablegen, and llvm-config), so that the LLVM build
does not attempt to build them, and instead relies on the tools already built.

If compiling with clang-cl, this change also adds the `--target` option
to specify the target triple. MSVC compilers do not require this, since there
is a separate compiler binary for cross-compilation.

adjust ub-enum test to be endianess-independent

@cuviper noted that our test fails on "other" endianess systems (I never know which is which^^), so let's fix that.

Fix cross compilation of LLVM to aarch64 Windows targets

When cross-compiling, the LLVM build system recurses to build tools that need to run on the host system. However, since we pass cmake defines to set the compiler and target, LLVM still compiles these tools for the target system, rather than the host. The tools then fail to execute during the LLVM build.

This change sets defines for the tools that need to run on the host (llvm-nm, llvm-tablegen, and llvm-config), so that the LLVM build does not attempt to build them, and instead relies on the tools already built.

If compiling with clang-cl, adds the `--target` option to specify the target triple. MSVC compilers do not require this, since there is a separate compiler binary for each cross-compilation target.

Related issue: rust-lang#72881
Requires LLVM change: rust-lang/llvm-project#67

…ttributes_name, r=GuillaumeGomez

rustdoc: Rename invalid_codeblock_attribute lint to be plural

Lint names should be plural as per the lint naming conventions: https://github.com/rust-lang/rfcs/blob/master/text/0344-conventions-galore.md#lints

r? @GuillaumeGomez

Update books

## book

3 commits in 4e7c00bece1544d409312ec93467beb62b5bd0cb..84a31397b34f9d405df44f2899ff17a4828dba18
2020-06-19 09:39:12 -0400 to 2020-07-04 10:50:18 -0500
- Update Windows install instructions (rust-lang/book#2389)
- Update ch01-02-hello-world.md (rust-lang/book#2386)
- bump mdbook version in github action (rust-lang/book#2380)

## reference

2 commits in 04d5d5d7ba624b6f5016298451f3a63d557f3260..0ea7bc494f1289234d8800bb9185021e0ad946f0
2020-06-16 15:08:05 -0700 to 2020-07-02 15:33:04 -0700
- Fix mis-capitalization of type name. (rust-lang/reference#844)
- Fix name of trait for array indexing. (rust-lang/reference#840)

## embedded-book

1 commits in 616962ad0dd80f34d8b802da038d0aed9dd691bb..94d9ea8460bcbbbfef1877b47cb930260b5849a7
2020-06-23 16:03:45 +0000 to 2020-07-05 14:17:40 +0000
- Note on transformation of static variables by attribute exception  (rust-embedded/book#251)

## rust-by-example

1 commits in 6f94ccb48da6fa4ed0031290f21411cf789f7d5e..229c6945a26a53a751ffa4f9cb418388c00029d3
2020-06-20 17:51:30 -0300 to 2020-07-06 10:13:15 -0300
- Modify comments (rust-lang/rust-by-example#1359)

…umeGomez

Fix broken link in rustdocdoc

The previous link redirects to https://www.rust-lang.org/learn.

Liballoc use vec instead of vector

Keep congruency with other parts, full word vector is rarely used.

Try remove unneeded ToString import in liballoc slice

…k-Simulacrum

Update rust-installer to latest version

This pulls in a fix for the install script on some tr(1) implementations,
as well as an update to use `anyhow` instead of `failure` for error
handling.

update miri

Fixes rust-lang#74132
Cc @rust-lang/miri r? @ghost