Revert "Zygote: Restrict slave mountspace so Dalvik apps can mount system-wide volumes"

This reverts commit b5158e3caba2b0ab44092228f50002419e6d876f.
Revert "dalvik: remove duplicated call to dvmJitCalleeSave()"

This reverts commit c16589f9bd40d65e8920e351608fe9f986218e02.