Refactor - Disables little-endian byte swap instructions in SBPFv2

[Lichtso]

Solves #354

In the LLVM backend these should be removed:
https://github.com/solana-labs/llvm-project/blob/7b8db05b564faffb522434b73b7082662171f94a/llvm/lib/Target/SBF/SBFInstrInfo.td#L901

[codecov-commenter]

Codecov Report

Merging #493 (7579ff3) into main (2fe4357) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #493   +/-   ##
=======================================
  Coverage   89.65%   89.65%           
=======================================
  Files          23       23           
  Lines       10145    10149    +4     
=======================================
+ Hits         9095     9099    +4     
  Misses       1050     1050           

Files Changed	Coverage Δ
src/elf.rs	87.41% <100.00%> (+0.02%)	⬆️
src/interpreter.rs	97.67% <100.00%> (ø)
src/jit.rs	92.50% <100.00%> (+<0.01%)	⬆️
src/verifier.rs	97.50% <100.00%> (ø)

[alessandrod]

Approving with a note that we don't have tests for the case where it's disabled. We probably don't need a test for each thing we're disabling, we could have one test_all_the_cruft_we_disabled_in_sbfv2 (not necessarily in this PR, just before we actually enable sbfv2)