PATCH: Consistent use of the noduplicate attribute

[Eli Bendersky]

Hello,

The "noduplicate" attribute of call instructions is sometimes queried
directly and sometimes through the cannotDuplicate() predicate. This patch
streamlines all queries to use the cannotDuplicate() predicate. It also
adds this predicate to InvokeInst, to mirror what CallInst has.

In addition, setCannotDuplicate() is removed because it's not being used
anywhere in the codebase.

PTAL,
Eli
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