[PATCH 2/3] selftests/x86/entry_from_vm86: Add test cases for POPF

POPF is currently broken -- add tests to catch the error. This results in: [RUN]POPF with VIP set and IF clear from vm86 mode [INFO] Exited vm86 mode due to STI [FAIL] Incorrect return reason (started at eip = 0xd, ended at eip = 0xf) because POPF currently fails

[PATCH 2/3] selftests/x86/entry_from_vm86: Add test cases for POPF

POPF is currently broken -- add tests to catch the error. This results in: [RUN]POPF with VIP set and IF clear from vm86 mode [INFO] Exited vm86 mode due to STI [FAIL] Incorrect return reason (started at eip = 0xd, ended at eip = 0xf) because POPF currently fails