ART: Ensure minimum stack size under ASAN

When running sanitized, ensure a minimum stack size of 2MB to
ensure that classes in the core library can be initialized in
tests even under the access-checks interpreter.

Bug: 109813469
Test: SANITIZE_HOST=address art/test/testrunner/testrunner.py -b --host --interp-ac -t 004-ThreadStress -t 054 -t 107 -t 203 -t 924 -t 1905 -t 1907 -t 1907 -t 1912 -t 1913 -t 1914 -t 1916 -t 1917 -t 1920 -t 1921 -t 1930 -t 1931 -t 1932 -t 1935 -t 1936
Change-Id: I702d36552bbc753e286e619937370518aecf9692