refactor(op): Move op l1 block load to op handler

[rakita]

Move op specific l1 load to its own function

[github-actions]

Valgrind Results:

==3963== Cachegrind, a cache and branch-prediction profiler
==3963== Copyright (C) 2002-2017, and GNU GPL'd, by Nicholas Nethercote et al.
==3963== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==3963== Command: target/release/snailtracer
==3963== 
--3963-- warning: L3 cache found, using its data for the LL simulation.
Snailtracer Host+Interpreter benchmark (2.1s) ...            not enough samples
==3963== 
==3963== I   refs:      463,564,709
==3963== I1  misses:         23,523
==3963== LLi misses:          2,903
==3963== I1  miss rate:        0.01%
==3963== LLi miss rate:        0.00%
==3963== 
==3963== D   refs:      237,389,303  (160,565,579 rd   + 76,823,724 wr)
==3963== D1  misses:        323,766  (    183,934 rd   +    139,832 wr)
==3963== LLd misses:        137,539  (      4,063 rd   +    133,476 wr)
==3963== D1  miss rate:         0.1% (        0.1%     +        0.2%  )
==3963== LLd miss rate:         0.1% (        0.0%     +        0.2%  )
==3963== 
==3963== LL refs:           347,289  (    207,457 rd   +    139,832 wr)
==3963== LL misses:         140,442  (      6,966 rd   +    133,476 wr)
==3963== LL miss rate:          0.0% (        0.0%     +        0.2%  )