[libc++abi] Allow code-signing executables when running the tests

GitOrigin-RevId: 62c1750ea90f6c42ad8d58d341a405904560db08
diff --git a/test/lit.site.cfg.in b/test/lit.site.cfg.in
index 8125e89..69f34da 100644
--- a/test/lit.site.cfg.in
+++ b/test/lit.site.cfg.in
@@ -29,5 +29,7 @@
 config.pstl_src_root            = "@ParallelSTL_SOURCE_DIR@" if @LIBCXX_ENABLE_PARALLEL_ALGORITHMS@ else None
 config.pstl_obj_root            = "@ParallelSTL_BINARY_DIR@" if @LIBCXX_ENABLE_PARALLEL_ALGORITHMS@ else None
 
+config.llvm_codesign_identity   = "@LLVM_CODESIGNING_IDENTITY@"
+
 # Let the main config do the real work.
 lit_config.load_config(config, "@LIBCXXABI_SOURCE_DIR@/test/lit.cfg")