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Revert "[NFC] Replace a linked list in LiveDebugVariables pass with a DenseMap"

Authored by andreadb on Oct 29 2019, 5:04 AM.

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Revert "[NFC] Replace a linked list in LiveDebugVariables pass with a DenseMap"

This reverts commit 8af5ada09319e5a021d57a1a03715b2fd022e415.

As Bjorn pointed out in D68816, the iteration over UserVals may not be safe.

Reverting on behalf of Orlando.