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5dd41a27d4
Summary:
This patch teaches `DT.applyUpdates` to take the fast when applying zero or just one update and makes it not run the internal batch updater machinery.
With this patch, it should no longer make sense to have a special check in user's code that checks the update sequence size before applying them, e.g.
```
if (!MyUpdates.empty())
DT.applyUpdates(MyUpdates);
```
or
```
if (MyUpdates.size() == 1)
if (...)
DT.insertEdge(...)
else
DT.deleteEdge(...)
```
Reviewers: dberlin, brzycki, davide, grosser, sanjoy
Reviewed By: dberlin, davide
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D38541
llvm-svn: 314917
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