Nate Chandler cea0f00598 [InstructionDeleter] Delete dead load [take]s. ...

Previously, `isScopeAffectingInstructionDead` determined that
an otherwise satisfactory `load` was not dead if it was a `load [take]`.
The immediate effect was that dead `load [take]`s were not deleted.  The
downstream effect was that otherwise dead graphs of instructions would
not be deleted.  This was especially a problem for OSLogOptimization
which deletes a great deal of code.

Here, the InstructionDeleter is taught to compensate for the deletion of
such `load [take]` by inserting `destroy_addr`s in their stead.

rdar://117011668

2023-11-01 14:42:28 -07:00

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