[NFC] Simplify externref literal representation#8765
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Instead of using a complex bit-packing scheme to represent externref payloads and differentiate them from externalized internal references, simply store the payload in the GCData. Externalized internal references are also stored in the GCData, but can be differentiated from externref payloads because the latter have type i32 and the former are always reference types. Besides being complex, the bit packing scheme was also incorrect on big-endian architectures.
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Instead of using a complex bit-packing scheme to represent externref payloads and differentiate them from externalized internal references, simply store the payload in the GCData. Externalized internal references are also stored in the GCData, but can be differentiated from externref payloads because the latter have type i32 and the former are always reference types.
Besides being complex, the bit packing scheme was also incorrect on big-endian architectures.