Don't retrieve generic information during ti-stress

This cuts down significantly on memory use during these tests and
prevents test-failing log-messages from being generated in some
situations.

Test: ./test/run-test --host --jvmti-field-stress 044-proxy
Bug: 120995005
Change-Id: I8f65096d7d08f4d50f4c71607b8ba8b1859b0382