…ions.

(cherry picked from commit 780ebea)

In order to allow `Argument`s to be printed nicely.

> before
```julia
julia> code_typed((Float64,)) do x
           sin(x)
       end
1-element Vector{Any}:
 CodeInfo(
1 ─ %1 = invoke Main.sin(_2::Float64)::Float64
└──      return %1
) => Float64

julia> code_typed((Bool,Any,Any)) do c, x, y
           z = c ? x : y
           z
       end
1-element Vector{Any}:
 CodeInfo(
1 ─      goto #3 if not c
2 ─      goto #4
3 ─      nothing::Nothing
4 ┄ %4 = φ (#2 => _3, #3 => _4)::Any
└──      return %4
) => Any
```

> after
```julia
julia> code_typed((Float64,)) do x
           sin(x)
       end
1-element Vector{Any}:
 CodeInfo(
1 ─ %1 = invoke Main.sin(x::Float64)::Float64
└──      return %1
) => Float64

julia> code_typed((Bool,Any,Any)) do c, x, y
           z = c ? x : y
           z
       end
1-element Vector{Any}:
 CodeInfo(
1 ─      goto #3 if not c
2 ─      goto #4
3 ─      nothing::Nothing
4 ┄ %4 = φ (#2 => x, #3 => y)::Any
└──      return %4
) => Any
```

The added condition improves compatiblity with Nix mtime.

(cherry picked from commit f5e0f9d)

… build Julia (#43073)

(cherry picked from commit a21cc80)

(cherry picked from commit 99f6558)

(cherry picked from commit 3103102)

(cherry picked from commit 6bea8e3)

This version has been rebuilt to have 32 threads by default, instead of 512 as
it accidentally happened before.  The large number of threads caused problems on
some platforms, including `StackOverflowError`s.

(cherry picked from commit 4486567)

Includes several fixes: JuliaLang/libuv@c6869fb...3a63bf7

(cherry picked from commit 2b1ece9)

If connect(::CustomClusterManager, ...) returns a custom transport
stream, use of that stream by the task in start_gc_msgs_task() may fail
due to the task executing in an old world age. Add an invokelatest() to
prevent this problem.

(cherry picked from commit a05bcb2)

I am not sure why we ever used round+1 instead of ceil+1, as this is
simply strictly more correct.

(cherry picked from commit d6f59fa)

Just explicitely check for `CodeInfo` objects and use an explicit
`return` in this case inside the `@generated` macro.

Co-authored-by: Jeff Bezanson <jeff.bezanson@gmail.com>
(cherry picked from commit 92c84bf)

release-1.6: Backports for 1.6.5

Co-authored-by: Jameson Nash <vtjnash@gmail.com>

[release-1.6] Backport "Unbreak source distribution tarball construction" for 1.6.5