[gn] port(ish) eccc6e2

Author: nico

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

@@ -27,3 +27,11 @@ unittest("ClangReplInterpreterTests") {
     ldflags = [ "-rdynamic" ]
   }
 }
+
+# FIXME: This is included conditionally in the CMake build if
+#        compiler-rt is available. The test currently fails in the GN
+#        build. Figure out if we can get it to pass.
+group("dummy_sources") {
+  sources = [ "OutOfProcessInterpreterTests.cpp" ]
+  not_needed(sources)
+}