add-release-note

Author: HerrCai0907

clang/docs/ReleaseNotes.rst

@@ -443,6 +443,7 @@ Bug Fixes in This Version
 - The warning emitted for an unsupported register variable type now points to
   the unsupported type instead of the ``register`` keyword (#GH109776).
 - Fixed a crash when emit ctor for global variant with flexible array init  (#GH113187).
+- Fixed a crash when GNU statement expression contains invalid statement (#GH113468).
 
 Bug Fixes to Compiler Builtins
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