[gn] port 3351097 (TargetMachineCTests)

Author: nico

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

@@ -46,6 +46,7 @@ group("unittests") {
     "Support:SupportTests",
     "Support/DynamicLibrary:DynamicLibraryTests",
     "TableGen:TableGenTests",
+    "Target:TargetMachineCTests",
     "TargetParser:TargetParserTests",
     "Testing/ADT:TestingADTTests",
     "Testing/Support:TestingSupportTests",

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

@@ -0,0 +1,6 @@
+import("//third-party/unittest/unittest.gni")
+
+unittest("TargetMachineCTests") {
+  deps = [ "//llvm/lib/Target:AllTargetsCodeGens" ]
+  sources = [ "TargetMachineOptionsTest.cpp" ]
+}