llvm doc: remove the old reference to subversion and add a link to the GH repo instead

run before every commit.

The whole programs tests are referred to as the "LLVM test suite" (or

"test-suite") and are in the ``test-suite`` module in subversion. For

historical reasons, these tests are also referred to as the "nightly

"test-suite") and are in the ``test-suite``

`repository on GitHub <https://github.com/llvm/llvm-test-suite.git>`_.

For historical reasons, these tests are also referred to as the "nightly

tests" in places, which is less ambiguous than "test-suite" and remains

in use although we run them much more often than nightly.

efficiency of the programs generated as well as the speed with which

LLVM compiles, optimizes, and generates code.

The test-suite is located in the ``test-suite`` Subversion module.

The test-suite is located in the ``test-suite``

`repository on GitHub <https://github.com/llvm/llvm-test-suite.git>`_.

See the :doc:`TestSuiteGuide` for details.

Quick start

===========

The tests are located in two separate Subversion modules. The unit and

regression tests are in the main "llvm" module under the directories

The tests are located in two separate repositories. The unit and

regression tests are in the main "llvm"/ directory under the directories

``llvm/unittests`` and ``llvm/test`` (so you get these tests for free with the

main LLVM tree). Use ``make check-all`` to run the unit and regression tests

after building LLVM.