Change how we decide which empty string implementation to use. #20708
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The feature macro seems to be lying on some toolchains. Instead, ask the compiler to try to run the default constructor in constexpr context which should fail if the implementation doesn't actually support it and fallback to the dynamic one. This should fix #20645 PiperOrigin-RevId: 737603382
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The feature macro seems to be lying on some toolchains. Instead, ask the compiler to try to run the default constructor in constexpr context which should fail if the implementation doesn't actually support it and fallback to the dynamic one.
This should fix #20645
PiperOrigin-RevId: 737603382
Cherry-pick of 3dfd88f