Cache the VM page size that we get from task_vm_info so we don't re-fetch the value.
Cache the VM page size that we get from task_vm_info so we don't
re-fetch the value.


git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@178962 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb