Add 8.10.4 release notes

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diff --git a/docs/users_guide/8.10.4-notes.rst b/docs/users_guide/8.10.4-notes.rst
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+.. _release-8-10-3:
+Release notes for version 8.10.4
+================================
+
+The significant changes to the various parts of the compiler are listed in the
+following sections.
+
+Like previous releases in the 8.10 series, the :ghc-flag:`LLVM backend <-fllvm>`
+of this release is to be used with LLVM 9.
+
+Bug Fixes
+---------
+
+- Fix a linker hang triggered by dynamic code loading on Windows
+  (:ghc-ticket:`19155`)
+
+- Fix a crash caused by inappropriate garbage of heap-allocated data reachable
+  from foreign exports (:ghc-tickets:`19149`).
+
+Known issues
+------------
+
+- A long-standing bug (:ghc-ticket:`16893`) which can cause some applications
+  of ``unsafeCoerce`` to segmentation fault is only partially fixed in this
+  release. This release only avoids this issue in the uses of ``unsafeCoerce``
+  in ``Data.Typeable.Internal``, which was the proximate cause of
+  :ghc-ticket:`16893`.
+
+  However, it is possible that this bug could manifest in user-code using
+  ``unsafeCoerce`` to perform dynamic type checks. See the :ghc-ticket:`ticket
+  <16893>` for details.
+
+  We expect that this issue will be fixed in the next major release of GHC.
+
+- A long-standing bug (:ghc-ticket:`17760`) where some uses of the ``touch#``
+  primop can be dropped by the simplifier is present in this release. This bug
+  will be fixed in GHC 9.0.1. In the meantime, see the :ghc-ticket:`ticket
+  <17760>` for mitigations.
+
+
+Included libraries
+------------------
+
+The package database provided with this distribution also contains a number of
+packages other than GHC itself. See the changelogs provided with these packages
+for further change information.
+
+.. ghc-package-list::
+
+    libraries/array/array.cabal:             Dependency of ``ghc`` library
+    libraries/base/base.cabal:               Core library
+    libraries/binary/binary.cabal:           Dependency of ``ghc`` library
+    libraries/bytestring/bytestring.cabal:   Dependency of ``ghc`` library
+    libraries/Cabal/Cabal/Cabal.cabal:       Dependency of ``ghc-pkg`` utility
+    libraries/containers/containers/containers.cabal:   Dependency of ``ghc`` library
+    libraries/deepseq/deepseq.cabal:         Dependency of ``ghc`` library
+    libraries/directory/directory.cabal:     Dependency of ``ghc`` library
+    libraries/exceptions/exceptions.cabal:   Dependency of ``haskeline`` library
+    libraries/filepath/filepath.cabal:       Dependency of ``ghc`` library
+    compiler/ghc.cabal:                      The compiler itself
+    libraries/ghci/ghci.cabal:               The REPL interface
+    libraries/ghc-boot/ghc-boot.cabal:       Internal compiler library
+    libraries/ghc-boot-th/ghc-boot-th.cabal: Internal compiler library
+    libraries/ghc-compact/ghc-compact.cabal: Core library
+    libraries/ghc-heap/ghc-heap.cabal:       GHC heap-walking library
+    libraries/ghc-prim/ghc-prim.cabal:       Core library
+    libraries/haskeline/haskeline.cabal:     Dependency of ``ghci`` executable
+    libraries/hpc/hpc.cabal:                 Dependency of ``hpc`` executable
+    libraries/integer-gmp/integer-gmp.cabal: Core library
+    libraries/libiserv/libiserv.cabal:       Internal compiler library
+    libraries/mtl/mtl.cabal:                 Dependency of ``Cabal`` library
+    libraries/parsec/parsec.cabal:           Dependency of ``Cabal`` library
+    libraries/pretty/pretty.cabal:           Dependency of ``ghc`` library
+    libraries/process/process.cabal:         Dependency of ``ghc`` library
+    libraries/stm/stm.cabal:                 Dependency of ``haskeline`` library
+    libraries/template-haskell/template-haskell.cabal:     Core library
+    libraries/terminfo/terminfo.cabal:       Dependency of ``haskeline`` library
+    libraries/text/text.cabal:               Dependency of ``Cabal`` library
+    libraries/time/time.cabal:               Dependency of ``ghc`` library
+    libraries/transformers/transformers.cabal: Dependency of ``ghc`` library
+    libraries/unix/unix.cabal:               Dependency of ``ghc`` library
+    libraries/Win32/Win32.cabal:             Dependency of ``ghc`` library
+    libraries/xhtml/xhtml.cabal:             Dependency of ``haddock`` executable
+
+
diff --git a/docs/users_guide/index.rst b/docs/users_guide/index.rst
index 505e233952..9c30306647 100644
--- a/docs/users_guide/index.rst
+++ b/docs/users_guide/index.rst
@@ -15,6 +15,7 @@ Contents:
    8.10.1-notes
    8.10.2-notes
    8.10.3-notes
+   8.10.4-notes
    ghci
    runghc
    usage