Fix the issue that the high 16-bit of EAX may contain invalid data, which cause bad stack pointer, the change will ensure the high 16-bit of EAX is cleared.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11048 6f19259b-4bc3-4df7-8a09-765794883524
2 files changed