restorer: Add "memory" constraint into asm statement
restorer: Add "memory" constraint into asm statement

It seems otherwise older gcc compilers do treat this
statement as incomplete.

Signed-off-by: Cyrill Gorcunov <7a1ea01eee6961eb1e372e3508c2670446d086f4@openvz.org>
Reported-by: Huang Qiang <488e06933c295c76472a67dbc6657ac40a756953@huawei.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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