Refactor driver code; de-duplicate and split APIs (#14095, !5555)

This commit does some de-duplication of logic between the one-shot and --make
modes, and splitting of some of the APIs so that its easier to do the
fine-grained parallelism implementation. This is the first part of the
implementation plan as described in #14095

* compileOne now uses the runPhase pipeline for most of the work.
  The Interpreter backend handling has been moved to the runPhase.

* hscIncrementalCompile has been broken down into multiple APIs.

* haddock submodule bump: Rename of variables in html-test ref:
  This is caused by a change in ModDetails in case of NoBackend.
  Now the initModDetails is used to recreate the ModDetails from interface and
  in-memory ModDetails is not used.

1 files changed, 0 insertions, 0 deletions

diff --git a/utils/haddock b/utils/haddock
-Subproject 3b6a8774bdb543dad59b2618458b07feab8a55e
+Subproject 804254a541d800ef983df7c98426014ff94430d