Michael Ilseman 5a6d2dfa59 [String] Switch ABI to only use 4 discriminator bits. ...

In anticipation of potential future HW features, e.g. armv8.5 memory
tagging, only use the high 4 bytes as discriminator bits in
_BridgeObject rather than the top 8 bits. Utilize two perf flags to
cover this instead. This requires shifting around a fair amount of
internal complexity.

2018-12-19 13:54:50 -08:00

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