add log support for llvm backend

[chenfengjin]

Description

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Fixes # (issue)

Type of change

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• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Brief of your solution

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How Has This Been Tested?

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[codecov-commenter]

Codecov Report

Merging #333 (6b43818) into llvm_backend (a8815c9) will decrease coverage by 0.07%. The diff coverage is 0.00%.

@@               Coverage Diff                @@
##           llvm_backend     #333      +/-   ##
================================================
- Coverage         45.92%   45.85%   -0.08%     
================================================
  Files               140      140              
  Lines             12361    12362       +1     
================================================
- Hits               5677     5668       -9     
- Misses             5526     5534       +8     
- Partials           1158     1160       +2     

Impacted Files	Coverage Δ
bcs/contract/xvm/debug.go	0.00% <0.00%> (ø)
bcs/consensus/xpoa/xpoa.go	51.26% <0.00%> (-2.04%)	:arrow_down:
bcs/network/p2pv2/server.go	51.33% <0.00%> (-1.07%)	:arrow_down:
kernel/consensus/base/driver/chained-bft/smr.go	40.59% <0.00%> (-0.75%)	:arrow_down:

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