Export of internal Abseil changes.

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a9115ecdf91183528f677fbbd9294652ab68c35f by CJ Johnson <johnsoncj@google.com>:

Shorten the names of the args of the public InlinedVector member functions

PiperOrigin-RevId: 230963027

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93eaa2e3826901bafd16b088c8b5b272a2650fbb by CJ Johnson <johnsoncj@google.com>:

Elevates input/forward iterator type checking to the top level of the InlinedVector API

PiperOrigin-RevId: 230771558
GitOrigin-RevId: a9115ecdf91183528f677fbbd9294652ab68c35f
Change-Id: I30524e1a2a6260c6947a7ad756caade9b0b2c82f