[pointer][invariant] Remove AliasingMapping, Inaccessible#1942
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## Ifc49755af0d90eeefe7822d755d508403c266bda #1942 +/- ##
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We previously used
AliasingMappings andInaccessibleto modelUnsafeCellagreement. This abuses the notion of a mapping since onedoesn't ever actually want to change the aliasing of a pointer (and
certainly not to
Inaccessible) - really this was meant to modelpointer casts which should never be performed. In addition to being an
awkward fit, the presence of
Inaccessiblemeant that code could notassume that any
Aliasinginvariant permitted reading, and so we had toadd extra machinery to work around this.
Future commits will use a different, simpler model for denoting
UnsafeCellagreement or disagreement.While we're here, make
Readslightly more permissive, implemented forA: Aliasing, T: Immutablerather than justA: Reference, T: Immutable.Makes progress on #1122, #1866
This PR is on branch ptr-overhaul-more-generic-issue-1945.