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dce086fa6e045bed433c664f95a6581b7ffb2d98 by Abseil Team <absl-team@google.com>:

fix spelling error "fulfil" -> "fulfill"

PiperOrigin-RevId: 339898016

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10faa4546b69d8a07f949bc03dd9671231232ad0 by Abseil Team <absl-team@google.com>:

Clarify comments on variant::emplace

PiperOrigin-RevId: 339897241

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0d02261a7a8b9c11e3a4e76dfedf4d95590e2419 by Derek Mauro <dmauro@google.com>:

Use thread_local for ThreadIdentity storage on Apple platforms
that support it

PiperOrigin-RevId: 339698124
GitOrigin-RevId: dce086fa6e045bed433c664f95a6581b7ffb2d98
Change-Id: I8c668b33c805fd5231ceb285652c80f312e5a33a