[libc++abi] Make sure we use a 32 bit guard on 32 bit Aarch64

GitOrigin-RevId: d0ad9e93ce546eb3d372f1b815b164ba137fd701
diff --git a/include/__cxxabi_config.h b/include/__cxxabi_config.h
index b5444d6..98f55b2 100644
--- a/include/__cxxabi_config.h
+++ b/include/__cxxabi_config.h
@@ -72,7 +72,7 @@
 #endif
 
 // wasm32 follows the arm32 ABI convention of using 32-bit guard.
-#if defined(__arm__) || defined(__wasm32__)
+#if defined(__arm__) || defined(__wasm32__) || defined(__ARM64_ARCH_8_32__)
 #  define _LIBCXXABI_GUARD_ABI_ARM
 #endif