Extremely minor code improvement

[owen-mc-diffblue]

Only review the last commit. This is based on #5115, and should be merged after it.

• Each commit message has a non-empty body, explaining why the change was made.
• Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• 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).
• My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[codecov-io]

Codecov Report

Merging #5121 into develop will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff            @@
##           develop    #5121   +/-   ##
========================================
  Coverage    66.95%   66.95%           
========================================
  Files         1145     1145           
  Lines        93653    93653           
========================================
  Hits         62702    62702           
  Misses       30951    30951

Flag	Coverage Δ
#cproversmt2	42.68% <ø> (ø)	⬆️
#regression	63.44% <100%> (ø)	⬆️
#unit	31.83% <100%> (ø)	⬆️

Impacted Files	Coverage Δ
...src/java_bytecode/java_bytecode_convert_method.cpp	97.53% <100%> (ø)	⬆️

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[allredj]

✔️
Passed Diffblue compatibility checks (cbmc commit: 67ad143).
Build URL: https://travis-ci.com/diffblue/test-gen/builds/128498251

[allredj]

✔️
Passed Diffblue compatibility checks (cbmc commit: c156475).
Build URL: https://travis-ci.com/diffblue/test-gen/builds/128541493