Do not allow multiple possibly aliasing ptrs in an expression

  Relational comparisons should not involve multiple potentially
  aliasing pointers. Similarly this should hold for switch conditions
  and the two conditions involved in equality comparisons (separately!).
  This is a heuristic based on the C semantics that does only allow such
  operations when the base pointers do point into the same object.
  Since this makes aliasing likely we will bail out early instead of
  producing a probably failing runtime check.

llvm-svn: 288516

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