gn analyze output:
{
  "compile_targets": [],
  "status": "No dependency",
  "test_targets": []
}
gn analyze input:
{
  "files": [
    "//llvm/test/tools/UpdateTestChecks/update_llc_test_checks/Inputs/x86_asm_mir_mixed.ll",
    "//llvm/test/tools/UpdateTestChecks/update_llc_test_checks/Inputs/x86_asm_mir_mixed.ll.expected",
    "//llvm/test/tools/UpdateTestChecks/update_llc_test_checks/Inputs/x86_asm_mir_same_prefix.ll",
    "//llvm/test/tools/UpdateTestChecks/update_llc_test_checks/Inputs/x86_asm_mir_same_prefix.ll.expected",
    "//llvm/test/tools/UpdateTestChecks/update_llc_test_checks/x86-asm-mir-mixed.test",
    "//llvm/test/tools/UpdateTestChecks/update_llc_test_checks/x86-asm-mir-same-prefix.test",
    "//llvm/utils/UpdateTestChecks/common.py",
    "//llvm/utils/UpdateTestChecks/mir.py",
    "//llvm/utils/update_llc_test_checks.py"
  ],
  "test_targets": [
    "//clang-tools-extra/clangd/test:check-clangd",
    "//clang-tools-extra/test:check-clang-tools",
    "//clang/test:check-clang",
    "//compiler-rt/test/hwasan:check-hwasan",
    "//lld/test:check-lld",
    "//llvm/test:check-llvm"
  ],
  "additional_compile_targets": []
}