[LLVMdev] enable globalsmodref-aa by default

[Xin Tong]

Hello


I am trying to enable globalsmodref-aa by default. globalmodref-aa is a
ModulePass and therefore can be invalidated and need to be rerun.


I see globalsmodref-aa is enabled in LTO passmanager by adding the analysis
pass explicitly. I wonder whether globalsmodref-aa can be enabled/run based
on pass dependencies, i.e. those indicated in getAnalysisUsage().

Thanks,
Xin
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