Erik Eckstein 67ce72cebb MemBehavior: fix minor bugs for `begin_access and end_access`. ...

* ``begin_access [modify]`` returned MayWrite, but "modify" means, it can be a read as well.
Instead, return MayReadWrite. Only for ``begin_access [init]`` return MayWrite.
This is more or less cosmetic - probably this bug had no real impact on any optimization.

* ``begin_access [deinit]`` needs to return MayReadWrite for the same reason ``destroy_addr`` returns MayReadWrite (see SILInstruction::MemoryBehavior).

2021-03-24 12:16:07 +01:00

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