fix offset>=so.size() assertion

[bjjwwang]

if offset is larger than so.size(), set offset the last element.

[codecov]

Codecov Report

Merging #1272 (0ea3137) into master (1ec4620) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

❗ Current head 0ea3137 differs from pull request most recent head b40866a. Consider uploading reports for the commit b40866a to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1272      +/-   ##
==========================================
- Coverage   64.50%   64.49%   -0.02%     
==========================================
  Files         223      223              
  Lines       23796    23800       +4     
==========================================
  Hits        15349    15349              
- Misses       8447     8451       +4     

Files	Coverage Δ
svf/lib/MemoryModel/AccessPath.cpp	3.12% <0.00%> (-0.14%)	⬇️