[docs] Add release notes for things that I've been involved in

clang/docs/ReleaseNotes.rst

@@ -81,6 +81,10 @@ New Compiler Flags
 - The ``-mno-bti-at-return-twice`` flag will make sure a BTI instruction won't
   be added after a setjmp or possible other return-twice construct (ARM backend
   only).
+- The ``--start-no-unused-arguments`` and ``--end-no-unused-arguments`` flags
+  allow silencing warnings about unused arguments for only a subset of
+  the command line arguments, keeping potential warnings for other arguments
+  outside of such a region.
 
 Deprecated Compiler Flags
 -------------------------
@@ -164,6 +168,16 @@ Windows Support
 
 - Support for on-demand initialization of TLS variables was added.
 
+- Improved code generation for ARM, by assuming less strict alignment
+  requirements for instructions (just like other OSes do).
+
+- Fixed using the ``-m32`` flag in x86_64 MinGW setups, by e.g. making ``-m32``
+  pick i686 instead of i386, if there is no i386 sysroot, but only one for
+  i686.
+
+- Fixed passing the ``--no-demangle`` option through to the linker for MinGW
+  targets.
+
 C Language Changes in Clang
 ---------------------------
 

lld/docs/ReleaseNotes.rst

@@ -58,12 +58,17 @@ Breaking changes
 COFF Improvements
 -----------------
 
-* ...
+* Correctly handle a signed immediate offset in ARM64 adr/adrp relocations.
+  (`D114347 <https://reviews.llvm.org/D114347>`_)
+
+* Omit section and label symbols from the symbol table.
+  (`D113866 <https://reviews.llvm.org/D113866>`_)
 
 MinGW Improvements
 ------------------
 
-* ...
+* ``--heap`` is now handled.
+  (`D118405 <https://reviews.llvm.org/D118405>`_)
 
 MachO Improvements
 ------------------

llvm/docs/ReleaseNotes.rst

@@ -80,12 +80,17 @@ Changes to the AArch64 Backend
   the use of the -mtune frontend flag. This allows certain scheduling features
   and optimisations to be enabled independently of the architecture. If the
   "tune-cpu" attribute is absent it tunes according to the "target-cpu".
+* Fixed relocations against temporary symbols (e.g. in jump tables and
+  constant pools) in large COFF object files.
 
 Changes to the ARM Backend
 --------------------------
 
 * Added support for the Armv9-A, Armv9.1-A and Armv9.2-A architectures.
 * Added support for the Armv8.1-M PACBTI-M extension.
+* Changed the assembly comment string for MSVC targets to ``@`` (consistent
+  with the MinGW and ELF targets), freeing up ``;`` to be used as
+  statement separator.
 
 Changes to the MIPS Target
 --------------------------
@@ -124,6 +129,24 @@ Changes to the WebAssembly Target
 
 During this release ...
 
+Changes to the Windows Target
+-----------------------------
+
+* Changed how the ``.pdata`` sections refer to the code they're describing,
+  to avoid conflicting unwind info if weak symbols are overridden.
+
+* Fixed code generation for calling support routines for converting 128 bit
+  integers from/to floats on x86_64.
+
+* The preferred path separator form (backslashes or forward slashes) can be
+  configured in Windows builds of LLVM now, with the
+  ``LLVM_WINDOWS_PREFER_FORWARD_SLASH`` CMake option. This defaults to
+  true in MinGW builds of LLVM.
+
+* Set proper COFF symbol types for function aliases (e.g. for Itanium C++
+  constructors), making sure that GNU ld exports all of them correctly as
+  functions, not data, when linking a DLL.
+
 Changes to the OCaml bindings
 -----------------------------
 
@@ -134,6 +157,9 @@ Changes to the C API
 * ``LLVMSetInstDebugLocation`` has been deprecated in favor of the more general
   ``LLVMAddMetadataToInst``.
 
+* Fixed building LLVM-C.dll for i386 targets with MSVC, which had been broken
+  since the LLVM 8.0.0 release.
+
 Changes to the Go bindings
 --------------------------
 
@@ -159,6 +185,8 @@ Changes to the LLVM tools
   `-name-whitelist` is marked as deprecated and to be removed in future
   releases.
 
+* llvm-readobj: Improved printing of symbols in Windows unwind data.
+
 Changes to LLDB
 ---------------------------------
 
@@ -177,6 +205,8 @@ Changes to LLDB
 * The ``memory read`` command has a new option ``--show-tags``. Use this option
   to show memory tags beside the contents of tagged memory ranges.
 
+* Fixed continuing from breakpoints and singlestepping on Windows on ARM/ARM64.
+
 Changes to Sanitizers
 ---------------------