Update getHost methods to also copy host flags, for use in exec->host transitions. Currently, the exec transition also calls getHost. As currently implemented, this means any host_* options get reset to defaults, instead of what was actually passed. In a further transition to a real host config, the expected set of flags won't be set. This change fixes getHost so that host_* options are kept, so that exec->host transitions work as expected. Part of work on execution transitions, #7935. PiperOrigin-RevId: 248386317
{Fast, Correct} - Choose two
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