[gn build] Port ca6e386cbf5b (#198009)

llvm/utils/gn/secondary/llvm/lib/MC/BUILD.gn

diff --git a/llvm/utils/gn/secondary/llvm/lib/MC/BUILD.gn b/llvm/utils/gn/secondary/llvm/lib/MC/BUILD.gn
index 7d0f532..4efd5a4 100644
--- a/llvm/utils/gn/secondary/llvm/lib/MC/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/lib/MC/BUILD.gn
@@ -14,6 +14,7 @@
   ]
   sources = [
     "ConstantPools.cpp",
+    "DXContainerInfo.cpp",
     "DXContainerPSVInfo.cpp",
     "DXContainerRootSignature.cpp",
     "ELFObjectWriter.cpp",