Java front-end and allocate objects: do not use goto code types

[tautschnig]

Code that deals with symbol tables only should not create codet
structures defined in goto-programs/goto_instruction_code.h.

• Each commit message has a non-empty body, explaining why the change was made.
• n/a Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• n/a The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• n/a My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• n/a White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[codecov]

Codecov Report

Merging #6571 (625265f) into develop (afc53d8) will increase coverage by 0.00%.
The diff coverage is 91.83%.

@@           Coverage Diff            @@
##           develop    #6571   +/-   ##
========================================
  Coverage    76.73%   76.73%           
========================================
  Files         1579     1579           
  Lines       181999   181997    -2     
========================================
+ Hits        139652   139653    +1     
+ Misses       42347    42344    -3     

Impacted Files	Coverage Δ
src/goto-programs/allocate_objects.h	100.00% <ø> (ø)
src/goto-programs/slice_global_inits.h	0.00% <0.00%> (ø)
src/goto-programs/string_instrumentation.h	0.00% <0.00%> (ø)
jbmc/src/java_bytecode/assignments_from_json.cpp	97.28% <100.00%> (+0.02%)	⬆️
...bmc/src/java_bytecode/java_static_initializers.cpp	100.00% <100.00%> (ø)
jbmc/src/java_bytecode/nondet.cpp	98.03% <100.00%> (ø)
jbmc/src/java_bytecode/simple_method_stubbing.cpp	82.22% <100.00%> (ø)
src/goto-programs/allocate_objects.cpp	92.39% <100.00%> (ø)
src/goto-programs/restrict_function_pointers.cpp	80.67% <100.00%> (+0.40%)	⬆️
src/memory-analyzer/gdb_api.h	100.00% <100.00%> (+9.52%)	⬆️
... and 8 more

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