Without this change GCC 5.4.0 failed to compile JSON.cpp with the error:
.../llvm-project/llvm/lib/Support/JSON.cpp: In lambda function:
.../llvm-project/llvm/lib/Support/JSON.cpp:291:29: error: use of 'V' before deduction of 'auto'
for (const auto &V : *V.getAsArray())
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