[gn build] Port 879f861

Author: llvmgnsyncbot

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

@@ -109,6 +109,7 @@ static_library("CodeGen") {
     "LowLevelTypeUtils.cpp",
     "LowerEmuTLS.cpp",
     "MBFIWrapper.cpp",
+    "MIR2Vec.cpp",
     "MIRCanonicalizerPass.cpp",
     "MIRFSDiscriminator.cpp",
     "MIRNamerPass.cpp",

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

@@ -31,6 +31,7 @@ unittest("CodeGenTests") {
     "InstrRefLDVTest.cpp",
     "LexicalScopesTest.cpp",
     "LowLevelTypeTest.cpp",
+    "MIR2VecTest.cpp",
     "MLRegAllocDevelopmentFeatures.cpp",
     "MachineBasicBlockTest.cpp",
     "MachineDomTreeUpdaterTest.cpp",