move nondet.h/.cpp and allocate_objects.h/.cpp

[kroening]

This moves allocate_objects.h/.cpp to goto-programs, since it relates to
procedural code.

nondet.h/.cpp are moved to jbmc, which is where it is used.

• 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 #6410 (cab7f30) into develop (3d64049) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #6410   +/-   ##
========================================
  Coverage    75.98%   75.98%           
========================================
  Files         1523     1523           
  Lines       164284   164284           
========================================
  Hits        124839   124839           
  Misses       39445    39445           

Impacted Files	Coverage Δ
jbmc/src/java_bytecode/assignments_from_json.cpp	97.26% <ø> (ø)
jbmc/src/java_bytecode/java_entry_point.cpp	89.35% <ø> (ø)
jbmc/src/java_bytecode/java_object_factory.cpp	94.33% <ø> (ø)
...c/java_bytecode/java_string_library_preprocess.cpp	97.43% <ø> (ø)
jbmc/src/java_bytecode/nondet.cpp	98.03% <ø> (ø)
src/ansi-c/c_nondet_symbol_factory.cpp	100.00% <ø> (ø)
src/ansi-c/c_nondet_symbol_factory.h	100.00% <ø> (ø)
...c/goto-harness/function_call_harness_generator.cpp	79.60% <ø> (ø)
src/goto-programs/allocate_objects.cpp	90.90% <ø> (ø)
src/goto-programs/allocate_objects.h	100.00% <ø> (ø)
... and 3 more

---

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