[llvm] r185040 - SLP: Dont erase instructions during vectorization because it prevents the outerloops from iterating over the instructions.

[Chandler Carruth]

On Wed, Jun 26, 2013 at 4:50 PM, Nadav Rotem <nrotem at apple.com> wrote:

> We have dead code.   But DCE runs right after the SLP.


It may not be worth it, but I found in SROA it was much more efficient to
keep a local vector of dead instructions that I manually went and deleted
at the end of the pass. That way you don't have iterator invalidation
concerns, but you also don't re-do the work to prove them dead.
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