[docs] Add release notes for Windows specific changes in 18.x

clang/docs/ReleaseNotes.rst

@@ -1195,6 +1195,8 @@ Windows Support
   linking may succeed but the resulting executables may expose issues at
   runtime.
 
+- Clang now passes relevant LTO options to the linker (LLD) in MinGW mode.
+
 LoongArch Support
 ^^^^^^^^^^^^^^^^^
 - Added builtins support for all LSX (128-bits SIMD) and LASX (256-bits SIMD)

lld/docs/ReleaseNotes.rst

@@ -41,9 +41,25 @@ COFF Improvements
 * Added support for ``--time-trace`` and associated ``--time-trace-granularity``.
   This generates a .json profile trace of the linker execution.
 
+* Prefer library paths specified with ``-libpath:`` over the implicitly
+  detected toolchain paths.
+
 MinGW Improvements
 ------------------
 
+* Added support for many LTO and ThinLTO options.
+
+* LLD no longer tries to autodetect and pick up MSVC/WinSDK installations
+  when run in MinGW mode.
+
+* The ``--icf=safe`` option now works as expected; it was previously a no-op.
+
+* More correctly handle LTO of files that define ``__imp_`` prefixed dllimport
+  redirections.
+
+* The strip flags ``-S`` and ``-s`` now can be used to strip out DWARF debug
+  info and symbol tables while emitting a PDB debug info file.
+
 MachO Improvements
 ------------------
 

llvm/docs/ReleaseNotes.rst

@@ -319,6 +319,18 @@ Changes to the LLVM tools
 * llvm-objcopy now supports ``--gap-fill`` and ``--pad-to`` options, for
   ELF input and binary output files only.
 
+* llvm-rc and llvm-windres now accept file path references in ``.rc`` files
+  concatenated from multiple string literals.
+
+* The llvm-windres option ``--preprocessor`` now resolve its argument
+  in the PATH environment variable as expected, and options passed with
+  ``--preprocessor-arg`` are placed before the input file as they should.
+
+* The llvm-windres option ``--preprocessor`` has been updated with the
+  breaking behaviour change from GNU windres from binutils 2.36, where
+  the whole argument is considered as one path, not considered as a
+  sequence of tool name and parameters.
+
 Changes to LLDB
 ---------------------------------
 
@@ -359,6 +371,8 @@ Changes to LLDB
   fields are present, however this is not always possible or entirely
   accurate. If in doubt, refer to the numerical value.
 
+* On Windows, LLDB can now read the thread names.
+
 Changes to Sanitizers
 ---------------------
 * HWASan now defaults to detecting use-after-scope bugs.