Make constructor and at_exit handler non-static

Bug: http://b/187935521

This change fixes a crash in dalvikvm.  These functions were mistakenly
marked as static but doesn't need to be.

Test: m CLANG_COVERAGE=true NATIVE_COVERAGE_PATHS="art";
      atest -v art-run-test-001-HelloWorld
Change-Id: I515addc298633437f1a91cf5e96d17c28c7a61ff
1 file changed