[ir] Fix irpass::analysis::clone on TLS/BLS prologue/epilogue

[yuanming-hu]

Related issue = #742

[Click here for the format server]

---

[codecov]

Codecov Report

Merging #1811 into master will increase coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1811      +/-   ##
==========================================
+ Coverage   64.12%   64.25%   +0.13%     
==========================================
  Files          19       19              
  Lines        3688     3710      +22     
  Branches      696      700       +4     
==========================================
+ Hits         2365     2384      +19     
- Misses       1197     1200       +3     
  Partials      126      126              

Impacted Files	Coverage Δ
python/taichi/lang/impl.py	67.31% <0.00%> (-0.01%)	⬇️
python/taichi/lang/transformer.py	81.88% <0.00%> (+0.27%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c3f1a5d...8537611. Read the comment docs.

[archibate]

This branch is out-of-date with the base branch

What happened to our project settings these time? If you did this, could you revert? I don't think it's reducing possible error at all.. Instead, it increase the difficulty of workflow for maintainers.

[k-ye]

Thanks LGTM!