[Support] Simplify has_StreamOperator (NFC) (#159242) Without this patch, we are doing a roundtrip on types. Specifically, if decltype(...) is well formed, std::is_same_v evaluates to a boolean value. We then pass the boolean value to std::enable_if_t, go through the sizeof(char)/sizeof(double) trick, and then come back to a boolean value. This patch simplifies all this by having test() return std::is_same<...>. The "caller" attaches ::value, so effectively we are using std::is_same<...>::value when decltype(...) is well formed, bypassing std::enable_if_t and the sizeof(char)/sizeof(double) trick. If we did not care about the return type of the shift operator, we could use llvm::is_detected, but the return type check doesn't allow us to simplify things that far.
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