[llvm-commits] [PATCH] simplify construction and destruction of Uses

[Jay Foad]

This patch makes sure that we consistently use placement new to
construct Uses, and that we destroy them before the memory is
deallocated. There should be no change in behaviour (because Use's
constructor did nothing, and its destructor was equivalent to
Use::set(0)) but I think it is more correct.

The patch also simplifies User::dropHungOffUses() and its callers.

OK to commit?

Thanks,
Jay.
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