[gn build] port clang-linker-wrapper build file

Tests now try to run it, so we need a build file for it.

llvm/utils/gn/secondary/clang/tools/clang-linker-wrapper/BUILD.gn

@@ -0,0 +1,24 @@
+executable("clang-linker-wrapper") {
+  configs += [ "//llvm/utils/gn/build:clang_code" ]
+  deps = [
+    "//clang/lib/Basic",
+    "//llvm/lib/Analysis",
+    "//llvm/lib/BinaryFormat",
+    "//llvm/lib/Bitcode/Writer",
+    "//llvm/lib/CodeGen",
+    "//llvm/lib/IR",
+    "//llvm/lib/IRReader",
+    "//llvm/lib/LTO",
+    "//llvm/lib/MC",
+    "//llvm/lib/Object",
+    "//llvm/lib/Passes",
+    "//llvm/lib/Support",
+    "//llvm/lib/Target",
+    "//llvm/lib/Target:TargetsToBuild",
+    "//llvm/lib/Transforms/Utils",
+  ]
+  sources = [
+    "ClangLinkerWrapper.cpp",
+    "OffloadWrapper.cpp",
+  ]
+}

llvm/utils/gn/secondary/clang/tools/driver/BUILD.gn

@@ -56,6 +56,7 @@ executable("clang") {
     "//clang/lib/Frontend",
     "//clang/lib/FrontendTool",
     "//clang/lib/Headers",
+    "//clang/tools/clang-linker-wrapper",
     "//clang/tools/clang-offload-bundler",
     "//clang/tools/clang-offload-wrapper",
     "//llvm/include/llvm/Config:llvm-config",