Correct architecture in release notes

Author: ostannard

clang/docs/ReleaseNotes.rst

@@ -1144,11 +1144,10 @@ Arm and AArch64 Support
 
   * FUJITSU-MONAKA (fujitsu-monaka)
 
-- The AArch64 calling convention for empty structs in C++ mode was changed to
-  pass them as if they have a size of 1 byte, matching the AAPCS64
-  specification and GCC's implementation. The previous behaviour of ignoring
-  the argument can be restored using the -fclang-abi-compat=19 (or earlier)
-  option.
+- The ARM calling convention for empty structs in C++ mode was changed to pass
+  them as if they have a size of 1 byte, matching the AAPCS32 specification and
+  GCC's implementation. The previous behaviour of ignoring the argument can be
+  restored using the -fclang-abi-compat=19 (or earlier) option.
 
 Android Support
 ^^^^^^^^^^^^^^^

clang/include/clang/Basic/LangOptions.h

@@ -245,7 +245,7 @@ class LangOptionsBase {
     ///   construction vtable because it hasn't added 'type' as a substitution.
     ///   - Skip mangling enclosing class templates of member-like friend
     ///   function templates.
-    ///   - Ignore empty struct arguments in C++ mode for AArch64, instead of
+    ///   - Ignore empty struct arguments in C++ mode for ARM, instead of
     ///   passing them as if they had a size of 1 byte.
     Ver19,