cannon: Refactor instrumented_state.go to extract reusable helpers

[mbaxter]

Description

Refactor instrumented_state.go to extract reusable helpers that will be useful for MTCannon.

Tests

This is just refactor, so existing tests should provide coverage.

Metadata

Part of: #11642

[codecov]

Codecov Report

Attention: Patch coverage is 51.30435% with 56 lines in your changes missing coverage. Please review.

Project coverage is 64.08%. Comparing base (4584c97) to head (8e0ba04).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #11174      +/-   ##
===========================================
- Coverage    64.41%   64.08%   -0.34%     
===========================================
  Files           27       30       +3     
  Lines         2147     2166      +19     
  Branches        71       71              
===========================================
+ Hits          1383     1388       +5     
- Misses         717      731      +14     
  Partials        47       47              

Flag	Coverage Δ
cannon-go-tests	79.70% <51.30%> (-0.63%)	⬇️
chain-mon-tests	27.14% <ø> (ø)
sdk-tests	16.44% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
cannon/mipsevm/exec/mips_instructions.go	97.84% <100.00%> (ø)
cannon/mipsevm/exec/mips_syscalls.go	93.33% <100.00%> (ø)
cannon/mipsevm/memory/memory.go	82.89% <100.00%> (ø)
cannon/mipsevm/singlethreaded/mips.go	94.00% <100.00%> (+24.47%)	⬆️
cannon/mipsevm/exec/memory.go	84.61% <84.61%> (ø)
cannon/mipsevm/exec/preimage.go	70.96% <70.96%> (ø)
cannon/mipsevm/singlethreaded/instrumented.go	57.37% <54.54%> (+0.02%)	⬆️
cannon/mipsevm/exec/stack.go	5.40% <5.40%> (ø)