[CUDA] Report that devices with cc >= sm_70 support seq_cst

[JackAKirk]

Report that devices with cc >= sm_70 support seq_cst memory consistency capabilities. Tested with intel/llvm#12516

[GeorgeWeb]

LGTM! 🥳

Btw, small aside, I think at some point it may be good we cache stuff like CU_DEVICE_ATTRIBUTE_COMPUTE_CAPABILITY_MAJOR in the device on init, as we seem to use it for a bunch of device cap queries, so while not much it may be useful to remove the overhead (or rather move it to a one-time on init).

[JackAKirk]

I've also now marked fence seq_cst supported by sm70. This is already the situation in the latest intel/llvm, see intel/llvm#12713 for a description.
I've unmarked this as ready to merge just to get an updated review for this small update. I think it makes sense to do both changes in the one PR.

[kbenzie]

Please pull in the main branch to have up to date testing, also update the tag in the intel/llvm PR.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 12.49%. Comparing base (9b97a5f) to head (4f5d005).
Report is 471 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1291      +/-   ##
==========================================
- Coverage   15.46%   12.49%   -2.98%     
==========================================
  Files         238      239       +1     
  Lines       33883    36003    +2120     
  Branches     3747     4086     +339     
==========================================
- Hits         5240     4498     -742     
- Misses      28593    31501    +2908     
+ Partials       50        4      -46     

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