VMX: Fix long mode activation

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This patch correctly sets the host vmx state to shadow guest state when
it enters long mode.

With this fix, we can have is_long_mode() test for EFER.LMA instead of EFER.LME
which was done in commit 3a001629eea909b2aa97f001a9db4700f15d986b but reverted
in commit 5e23049e86dd298b72e206b420513dbc3a240cd9 because it broke Windows x64
guests.

Please apply and then revert 5e23049e86dd298b72e206b420513dbc3a240cd9 or
re-cherry-pick 3a001629eea909b2aa97f001a9db4700f15d986b.

Amit
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