Revert "test: Remove icu cleanup hack"

This reverts commit d4b294c1.
Without this hack, the gCommonICUDataArray seems to
non-deterministically accumulate entries, and sometimes overflows,
causing test failures.

Bug: 31469648
Test: gdb /data/nativetest64/art/arm64/art_runtime_compiler_tests/reflection_test
Change-Id: Ie5a5b7b957de79758a227bfd2919b4cd0155cde8