appveyor: Fix a switched condition for cargotest

It was intended that EXCLUDE_CARGO *doesn't* run cargotest!

It was intended that EXCLUDE_CARGO *doesn't* run cargotest!

Rollup of 9 pull requests

- Successful merges: #48511, #48549, #48618, #48624, #48651, #48698, #48778, #48787, #48802
- Failed merges: #48669, #48710

Take two more slow builders and split them in two to get them under 2 hrs

Remove unused 'src/etc/ziggurat_tables.py' Python script.

This Python script was used to generate a `ziggurat_tables.rs` file in
librand, but librand was moved out of the repo.

* https://github.com/rust-lang/rust/commits/master/src/librand/distributions/ziggurat_tables.rs
* https://github.com/rust-lang-nursery/rand/blob/master/utils/ziggurat_tables.py

Stabilize option_ref_mut_cloned

Closes #43738.

Fix save-analysis generation crash with invalid tuple access

Reproduction:

```rust
fn invalid_tuple_struct_accessing() {
    bar.0;
}
```
```
error[E0425]: cannot find value `bar` in this scope
 --> test.rs:2:5
  |
2 |     bar.0;
  |     ^^^ not found in this scope

error[E0601]: main function not found

error: internal compiler error: librustc_save_analysis/dump_visitor.rs:1678: Expected struct or tuple type, found TyError
 --> test.rs:2:5
  |
2 |     bar.0;
  |     ^^^^^

thread 'rustc' panicked at 'Box<Any>', librustc_errors/lib.rs:482:9
note: Run with `RUST_BACKTRACE=1` for a backtrace.
```

This should fix a crash in RLS when editing such code. cc @nrc

Remove ty::Predicate::Equate and ty::EquatePredicate (dead code)

r? @nikomatsakis

I also killed the EquatePredicate subsystem. Does it look fine?

Close #48670

Fixed #48425 : Various functions taking a `TyCtxt` and a `Span` should be taking a `TyCtxtAt`

Hi @oli-obk
I have done some code refactoring to fix #48425, Please let me know if anything else is required on this.

Better docs and associated SUCCESS/FAILURE for process::ExitCode

Follow-up to https://github.com/rust-lang/rust/pull/48497#discussion_r170676525, since that PR was the minimal thing to unblock https://github.com/rust-lang/rust/issues/48453#issuecomment-368155082.

r? @nikomatsakis

Drop rustc-serialize, add winapi 0.3 and Serde!

Add resource-suffix option for rustdoc

Alternative version of #48442.

cc @onur

r? @QuietMisdreavus

Part of #47320

Part of #47320

Part of #47320

Part of #47320

Part of #47320

Part of #47320

Part of #47320

Part of #47320

Part of #47320

This Python script was used to generate a `ziggurat_tables.rs` file in
librand, but librand was moved out of the repo.

* https://github.com/rust-lang/rust/commits/master/src/librand/distributions/ziggurat_tables.rs
* https://github.com/rust-lang-nursery/rand/blob/master/utils/ziggurat_tables.py