Update CircleCI to use cuda11 (#3255)
* Update CircleCI to use cuda11
* Rebase on master
* Fix npm nodejs installation failure in CircleCI
* Trigger CircleCI build
* Update CircleCI to use aptitude to install npm and nodejs
* Add gcc environmental variable
* Update torch xla compiler to gcc-7
* Update CircleCI run_torch_xla_tests function
* Update CircleCI to install clang9
* Fix typo
