[roll] Roll fuchsia [starnix/tests] Test `mremap`/`vmsplice` together Looks like: 1) remapping a new private mapping on top of a `vmsplice`-ed private mapping does not modify the payload held in a pipe. Seems like the pipe payload continues to point to the old (POV of userspace) mapping. 2) writes to memory through a mapping that aliases a shared `vmsplice`-ed mapping modifies the payload held in a pipe. This makes sense since all mappings (memory pointed to by userspace and the pipe payload) point to the same backing memory. Note that `VmspliceTest.RemapNewMemoryOverBufferInPipe` trivially passes on Starnix because Starnix does not share the mapping with the buffer provided to `vmsplice`. Original-Bug: b/335701084 Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1032000 Original-Revision: 10fd3b56cc3b4bf37a7a5e2b889c553237452380 GitOrigin-RevId: 88ab074f1e8ae21280605bd88213924a7d4956f3 Change-Id: Ic552a944145c06606e81b8019383f109c3b30531
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