libthr: Preresolve selected EABI symbols on arm.

Add the ability to pre-resolve architecture-specific EABI symbols and
use it on arm for selected EABI functions. These functions can be called
with r

libthr: Preresolve selected EABI symbols on arm.

Add the ability to pre-resolve architecture-specific EABI symbols and
use it on arm for selected EABI functions. These functions can be called
with rtld bind lock write-locked, so they should be resolved in forward.

Reported by: Mark Millard <[email protected]>, John F Carr <[email protected]>
Reviewed by: kib, imp
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D46104

(cherry picked from commit 5670b8cc3672d5a6bc2c41eb48d7d01343c43ad0)

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