RISC-V Fixes for 5.0-rc7

This tag contains a pair of bug fixes that I'd like to include in 5.0:

* A fix to disambiguate swap from invalid PTEs, which fixes an error
  when trying to unmap PROT_NONE pages.
* A revert to an optimization of the size of flat binaries.  This is
  really a workaround to prevent breaking existing boot flows, but since
  the change was introduced as part of the 5.0 merge window I'd like to
  have the fix in before 5.0 so we can avoid a regression for any proper
  releases.

With these I hope we're out of patches for 5.0 in RISC-V land.
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