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Fixing #16415. This is a variant of @takenobu-hs's !769.

Due to #15934

This fixes #16440, where the build system incorrectly concluded that the
`.subsections_via_symbols` assembler directive was supported on a Linux
system. This was caused by the fact that gcc was invoked with `-flto`;
when so-configured gcc does not call the assembler but rather simply
serialises its AST for compilation during the final link.

This is described in Note [autoconf assembler checks and -flto].

(cherry picked from commit 7b090b53)

This fixes #16514: Xmm6-15 was restored based off rax instead of rsp.
The code was introduced in the fix for #14619.

(cherry picked from commit 9b131500371a07626e33edc56700c12322364560)

Fixes #16445.

(cherry picked from commit a32ac2f4d963b657c0a53359b492c593e82304b1)

It should work to write an indefinite package using TemplateHaskell,
so long as all of the actual TH code lives outside of the package.
However, cleverness we had to build TH code even when building
with -fno-code meant that we attempted to build object code for
modules in an indefinite package, even when the signatures were
not instantiated.  This patch disables said logic in the event
that an indefinite package is being typechecked.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>

Test Plan: validate

Reviewers: simonpj, bgamari

Reviewed By: bgamari

Subscribers: rwbarton, carter

GHC Trac Issues: #16219

Differential Revision: https://phabricator.haskell.org/D5475

(cherry picked from commit d6d735c1)

-ddump-json didn't work with --interactive as --interactive overwrote
the log_action in terms of defaultLogAction.

Reviewers: bgamari

Subscribers: rwbarton, thomie, carter

GHC Trac Issues: #14078

Differential Revision: https://phabricator.haskell.org/D4533

(cherry picked from commit 10faf44d)

This applies the fix from !516 to the 8.6 branch.

(cherry picked from commit d298cb9c)

(cherry picked from commit b90695cd)

`--supported-languages` must only advertise language extensions
which are supported by the compiler in order for tooling such
as Cabal relying on this signalling not to behave incorrectly.

Fixes #16331

(cherry picked from commit db4372cda7f6c87e7ad26efe3fca4b3f7f527a48)

This includes two bug fixes in profiling version of stg_ap_0_fast:

- PAPs allocated by stg_ap_0_fast are now correctly tagged. This
  invariant is checked in Sanity.c:checkPAP.

  (This was originally implemented in 2693eb11, later reverted with
  ab55b4dd because it revealed the bug below, but it wasn't clear at
  the time whether the bug was the one below or something in the commit)

- The local variable `untaggedfun` is now marked as a pointer so it
  survives GC.

With this we finally fix all known bugs caught in #15508. `concprog001`
now works reliably with prof+threaded and prof runtimes (with and
without -debug).

(cherry picked from commit 908b4b86)

(cherry picked from commit fb031b9b)

Previously `thNameToGhcName` was calling `lookupOrigNameCache` directly, which
failed to handle the case that the name wasn't already in the name cache. This
happens, for instance, when the name was in scope in a plugin being used during
compilation but not in scope in the module being compiled. In this case we the
interface file containing the name won't be loaded and `lookupOrigNameCache`
fails. This was the cause of #16104.

The solution is simple: use the nicely packaged `lookupOrigIO` instead.

(cherry picked from commit 0d9f105b)

This is the last failing test on Darwin preventing us from disallowing CI
failures. See #16201.

(cherry picked from commit 0b705fad)

See #16199.

See #16199

(See comments)

(cherry picked from commit 448f0e7d)

UNDERFLOW_FRAMEs don't have profiling headers so we have to use the
AP_STACK's function's CCS as the new frame's CCS.

Fixes one of the many bugs caught by concprog001 (#15508).

(cherry picked from commit 74cd4ec5)