[docs] Add release notes for Windows specific changes in 18.x (llvm#80011)

Author: mstorsjo

clang/docs/ReleaseNotes.rst

@@ -1268,6 +1268,8 @@ Windows Support
   to ensure compatibility with msvc. Previously strict aliasing was only disabled if the
   driver mode was cl.
 
+- Clang now passes relevant LTO options to the linker (LLD) in MinGW mode.
+
 LoongArch Support
 ^^^^^^^^^^^^^^^^^
 

llvm/docs/ReleaseNotes.rst

@@ -454,6 +454,19 @@ Changes to the LLVM tools
 
 * llvm-objdump now supports the ``--file-headers`` option for XCOFF object files.
 
+* llvm-rc and llvm-windres now accept file path references in ``.rc`` files
+  concatenated from multiple string literals.
+
+* The llvm-windres option ``--preprocessor`` now resolves its argument
+  in the PATH environment variable as expected, and options passed with
+  ``--preprocessor-arg`` are placed before the input file as they should
+  be.
+
+* 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
 ---------------------------------
 
@@ -477,6 +490,8 @@ Changes to BOLT
   binary functions with exact hash, allowing for the matching of renamed but
   identical functions.
 
+* On Windows, LLDB can now read the thread names.
+
 Changes to Sanitizers
 ---------------------