* Use bdw-gc upstream mt patch
* Update distribution-scripts

Fixes #8230

Spec: add `before_suite` and `after_suite`

Compiler: store and restore debug location when going to main

Compiler: use virtual type for `uninitialized`

This follows the earlier change https://github.com/crystal-lang/crystal/commit/0690e2f7f77e35ddea268b3039167ec88034bb8f#diff-ab21012862ff4bc662382874cb0c0485R240

Fixes #8219

When a new thread finishes very quickly it could happen that
the removal from the linked list was executed before the push.
The linked list didn't check for that situation and it ends corrupted.

Fix examples 2019 09

Compiler: fix missing `name_location` of some calls

Activate compiler warnings by default

* Move Process.times from sysconf(CLK_TCK) to getrusage

* Format const assignment

* Add RUsage for Linux on x86_64

* Add RUsage support for 32-bit Linux

* Move RUsage from sys/times.cr to sys/resource.cr

* Require the correct file

* Use arch-dependent word size

* Remove times.cr

It's not being used anymore so it can be safely deleted.

Remove the event loop fiber. Now the event loop is executed from any fiber when there are no more runnable fibers in the queue. (#8173)

Enable overflow by default