[gn build] Port c931ac5

Author: llvmgnsyncbot

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

@@ -128,6 +128,7 @@ static_library("CodeGen") {
     "MachineCopyPropagation.cpp",
     "MachineCycleAnalysis.cpp",
     "MachineDebugify.cpp",
+    "MachineDomTreeUpdater.cpp",
     "MachineDominanceFrontier.cpp",
     "MachineDominators.cpp",
     "MachineFrameInfo.cpp",

llvm/utils/gn/secondary/llvm/unittests/CodeGen/BUILD.gn

@@ -32,6 +32,7 @@ unittest("CodeGenTests") {
     "LowLevelTypeTest.cpp",
     "MLRegAllocDevelopmentFeatures.cpp",
     "MachineBasicBlockTest.cpp",
+    "MachineDomTreeUpdaterTest.cpp",
     "MachineInstrBundleIteratorTest.cpp",
     "MachineInstrTest.cpp",
     "MachineOperandTest.cpp",