[docs] Refine some of the wording in the quality developer policy (llvm#156555)

I split these edits out of PR llvm#154441

Author: rnk

llvm/docs/DeveloperPolicy.rst

@@ -296,54 +296,53 @@ Quality
 The minimum quality standards that any change must satisfy before being
 committed to the main development branch are:
 
-#. Code must adhere to the `LLVM Coding Standards <CodingStandards.html>`_.
+#. Code must adhere to the :doc:`LLVM Coding Standards <CodingStandards>`.
 
 #. Code must compile cleanly (no errors, no warnings) on at least one platform.
 
 #. Bug fixes and new features should `include a testcase`_ so we know if the
    fix/feature ever regresses in the future.
 
-#. Code must pass the ``llvm/test`` test suite.
-
-#. The code must not cause regressions on a reasonable subset of llvm-test,
-   where "reasonable" depends on the contributor's judgement and the scope of
-   the change (more invasive changes require more testing). A reasonable subset
-   might be something like "``llvm-test/MultiSource/Benchmarks``".
+#. Pull requests should build and pass premerge checks. For first-time
+   contributors, this will require an initial cursory review to run the checks.
 
 #. Ensure that links in source code and test files point to publicly available
-   resources and are used primarily to add additional information rather than
-   to supply critical context. The surrounding comments should be sufficient
-   to provide the context behind such links.
+   resources and are used primarily to add additional information rather than to
+   supply critical context. The surrounding comments should be sufficient to
+   provide the context behind such links.
 
 Additionally, the committer is responsible for addressing any problems found in
 the future that the change is responsible for.  For example:
 
-* The code should compile cleanly on all supported platforms.
+* The code needs to compile cleanly and pass tests on all stable `LLVM
+  buildbots <https://lab.llvm.org/buildbot/>`_.
 
-* The changes should not cause any correctness regressions in the ``llvm-test``
-  suite and must not cause any major performance regressions.
+* The changes should not cause any correctness regressions in the
+  `llvm-test-suite <https://github.com/llvm/llvm-test-suite>`_
+  and must not cause any major performance regressions.
 
 * The change set should not cause performance or correctness regressions for the
-  LLVM tools.
+  LLVM tools. See `llvm-compile-time-tracker.com <https://llvm-compile-time-tracker.com>`_
 
 * The changes should not cause performance or correctness regressions in code
   compiled by LLVM on all applicable targets.
 
-* You are expected to address any `GitHub Issues <https://github.com/llvm/llvm-project/issues>`_ that
-  result from your change.
+* You are expected to address any `GitHub Issues
+  <https://github.com/llvm/llvm-project/issues>`_ that result from your change.
 
-We prefer for this to be handled before submission but understand that it isn't
-possible to test all of this for every submission.  Our build bots and nightly
-testing infrastructure normally finds these problems.  A good rule of thumb is
-to check the nightly testers for regressions the day after your change.  Build
-bots will directly email you if a group of commits that included yours caused a
+Our build bots and `nightly testing infrastructure
+<https://llvm.org/docs/lnt/intro.html>`_ find many of these issues. Build bots
+will directly email you if a group of commits that included yours caused a
 failure.  You are expected to check the build bot messages to see if they are
-your fault and, if so, fix the breakage.
+your fault and, if so, fix the breakage. However, keep in mind that if you
+receive such an email, it is highly likely that your change is not at fault.
+Changes are batched together precisely because these tests are generally too
+expensive to run continuously for every change.
+
+Commits that violate these quality standards may be reverted (see below). This
+is necessary when the change blocks other developers from making progress. The
+developer is welcome to re-commit the change after the problem has been fixed.
 
-Commits that violate these quality standards (e.g. are very broken) may be
-reverted. This is necessary when the change blocks other developers from making
-progress. The developer is welcome to re-commit the change after the problem has
-been fixed.
 
 .. _commit messages: