[trans-mem] First cut at new multi-vendor language spec

[Richard Henderson <rth at redhat dot com>]

This is a first-cut transformation from the Intel language spec that we 
began with last year, to the multi-vendor language spec that was 
published in August.  A copy of the new spec is on the GCC wiki page for 
transactional memory.

This is more or less a 1-1 conversion so far.  There are additional 
features that I've not implemented, and quite a lot of new constraint 
checking that's not yet done.  But a conversion of all the old tests all 
works.


r~

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