Go patch committed: New lock/note implementation

[Ian Lance Taylor]

This patch updates the implementations of locks and notes used in libgo
to use the current version from the master Go library.  This now uses
futexes when running on GNU/Linux, while still using semaphores on other
systems.  This implementation should be faster, and does not require
explicit initialization.  Bootstrapped and ran Go testsuite on
x86_64-unknown-linux-gnu.  I tested both the futex and the semaphore
versions.  Committed to mainline.

Ian

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