cannon: Handle unaligned futex addresses

[mbaxter]

Description

Align the futex address argument upfront. Use the aligned address in the State.Wakeup and ThreadState.FutexAddr fields.

Tests

Add tests with unaligned address arguments for FutexWait and FutexWake. Add tests for handling a waiting thread with an unaligned FutexAddr.

Metadata

Fixes #11650

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.43%. Comparing base (4af1fe6) to head (3b4060f).
Report is 6 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #11929      +/-   ##
===========================================
+ Coverage    79.42%   79.43%   +0.01%     
===========================================
  Files           41       41              
  Lines         3412     3414       +2     
===========================================
+ Hits          2710     2712       +2     
  Misses         532      532              
  Partials       170      170              

Flag	Coverage Δ
cannon-go-tests	79.43% <100.00%> (+0.01%)	⬆️

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Files with missing lines	Coverage Δ
cannon/mipsevm/multithreaded/mips.go	95.69% <100.00%> (+0.02%)	⬆️