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This is due to the failures documented in #16087. The condition here could be
improved as it matches on `BUILD_FLAVOUR` instead of looking at the compiler
flags. However, it's better than nothing and I hope we will be able to fix these
issues before long.

Adds a `-fenable-ide-info` flag which instructs GHC to generate `.hie`
files (see the wiki page:
https://ghc.haskell.org/trac/ghc/wiki/HIEFiles).

This is a rebased version of Zubin Duggal's (@wz1000) GHC changes for
his GSOC project, as posted here:
https://gist.github.com/wz1000/5ed4ddd0d3e96d6bc75e095cef95363d.

Test Plan: ./validate

Reviewers: bgamari, gershomb, nomeata, alanz, sjakobi

Reviewed By: alanz, sjakobi

Subscribers: alanz, hvr, sjakobi, rwbarton, wz1000, carter

Differential Revision: https://phabricator.haskell.org/D5239

This was supposed to be working already but didn't work when we
specified several tests with --only. This patch not only fixes this
but also makes it possible to specify a subset of tests to run with the
TEST environment variable, like the make build system. Here are some
examples:

    hadrian/build.sh test --only=plugins01
    hadrian/build.sh test --only="plugins01 plugins02"
    TEST="plugins01 plugins02" hadrian/build.sh test
    TEST=plugins03 hadrian/build.sh test --only="plugins01 plugins02"

When both the TEST environment variable and the --only flag are used,
we simply concatenate the list of tests from both sources and ask the
testsuite driver to run them all.

This patch addresses #16026.

Test Plan: hadrian/build.sh test --only="plugins01 plugins02"

Reviewers: bgamari, snowleopard

Reviewed By: bgamari, snowleopard

Subscribers: rwbarton, carter

GHC Trac Issues: #16026

Differential Revision: https://phabricator.haskell.org/D5431

Building a dynamically linked ghc is broken do to incorrectly building
and installing libffi. This disables building a dynamically linked ghc
and ghc-iserv-dyn while keeping most of the code in the relevant
commits: 79d5427e and 89fa34ec

Test Plan:
Ensure build environment does NOT have a system libffi installed (you
may want to use a nix environment).
Then `hadrian/build.sh -c --flavour=default`.

Reviewers: bgamari, alpmestan

Reviewed By: alpmestan

Subscribers: rwbarton, carter

GHC Trac Issues: #15837

Differential Revision: https://phabricator.haskell.org/D5430

* (#15837 point 5) Use the -rpath gcc option and using the $ORIGIN
variable which the dynamic linker sets to the location of the ghc
binary.
* (#15837 point 4) "-fPIC -dynamic" options are used when building ghc
when either ghc or the rts have a dynamic way.
* (#15837 point 7) "-shared -dynload deploy" options are only used when
linking a library (no longer when linking a program).

Reviewers: bgamari, alpmestan

Reviewed By: alpmestan

Subscribers: adamse, rwbarton, carter

Differential Revision: https://phabricator.haskell.org/D5281

Sadly subtrees haven't worked quite as well as we would have liked for
developers. See Hadrian #440.