Improve/interceptors

[swissiety]

• remove deprecated builder.stmtgraph-manipulations - just do it directly
• readability
• simplify

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (4dd5bdb) 64.11% compared to head (bac33bc) 64.53%.
Report is 4 commits behind head on develop.

Files	Patch %	Lines
...code/interceptors/ConstantPropagatorAndFolder.java	82.85%	4 Missing and 2 partials ⚠️
...tup/java/bytecode/interceptors/CopyPropagator.java	83.33%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #858      +/-   ##
=============================================
+ Coverage      64.11%   64.53%   +0.42%     
- Complexity      3432     3451      +19     
=============================================
  Files            312      312              
  Lines          15105    15108       +3     
  Branches        2546     2544       -2     
=============================================
+ Hits            9684     9750      +66     
+ Misses          4516     4463      -53     
+ Partials         905      895      -10     

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