Only allocate global temporaries for their live ranges in invoker

[inducer]

Visible in https://gist.github.com/matthiasdiener/b50910994b638097c37c9162f2005982, from illinois-ceesd/mirgecom#1101.

As an extension, we could allow for reuse of allocations by multiple kernels.

Note that this is roughly equivalent to what @kaushikcfd's _alias_global_temporaries.