[PATCH] D72214: [GlobalOpt] Get DT only if it is available.

[Florian Hahn via Phabricator via llvm-commits]

fhahn added a comment.

In D72214#1814399 <https://reviews.llvm.org/D72214#1814399>, @ekatz wrote:

> The old PassManager has the function `getAnalysisIfAvailable` that should be used in case you only need to update an analysis (equivalent to `getCachedResult` of the new PassManager). You should probably switch to use this function, instead of the `SmallPtrSet<> DTRequested` technique.


I could not  get `getAnalysisIfAvailable` to get a function level analysis from a module pass. IIUC it only works for function passes.


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