Documentation/memory-barriers.txt: Cross-reference "tools/memory-model/"

A memory consistency model is now available for the Linux kernel [1],
which "can (roughly speaking) be thought of as an automated version of
memory-barriers.txt" and which is (in turn) "accompanied by extensive
documentation on its use and its design".

Inform the (occasional) reader of memory-barriers.txt of these
developments.

[1] https://marc.info/?l=linux-kernel&m=151687290114799&w=2

Co-developed-by: Andrea Parri <[email protected]>
Co-developed-by: Akira Yokosawa <[email protected]>
Signed-off-by: Andrea Parri <[email protected]>
Signed-off-by: Akira Yokosawa <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Acked-by: Peter Zijlstra <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

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