[compiler-rt][HWAsan} Add env prefixes in test

This patch adds env prefixes to some environment variables that get set
inside a hwasan test. This broke when enabling the internal shell on
AArch64 and was not caught as I did not test precommit there.

GitOrigin-RevId: 616b5ec4e461c9063ffbd9f9a520b741b6e97824
1 file changed