[gn build] Port 5cdd8832330e

llvm/utils/gn/secondary/clang/unittests/Format/BUILD.gn

diff --git a/llvm/utils/gn/secondary/clang/unittests/Format/BUILD.gn b/llvm/utils/gn/secondary/clang/unittests/Format/BUILD.gn
index 0b3f00c..88521a8 100644
--- a/llvm/utils/gn/secondary/clang/unittests/Format/BUILD.gn
+++ b/llvm/utils/gn/secondary/clang/unittests/Format/BUILD.gn
@@ -11,6 +11,7 @@
     "//llvm/lib/Support",
   ]
   sources = [
+    "AlignBracketsTest.cpp",
     "BracesInserterTest.cpp",
     "BracesRemoverTest.cpp",
     "CleanupTest.cpp",