memory: move preallocation code out of exec.c
So that backends can use it. Since we need the page size for efficiency, move code to compute it out of translate-all.c and into util/oslib-win32.c. Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NHu Tao <hutao@cn.fujitsu.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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