Chandler Carruth 5bfbc3f941 [AA] Make BasicAA just require domtree. ...

This doesn't change how many times we construct domtrees in the normal
pipeline, and it removes fragility and instability where basic-aa may
not be run in time to see domtrees because they happen to be constructed
afterward.

This isn't quite as clean as the change to memdep because there is
a mode where basic-aa specifically runs without domtrees -- in the
hacking version used by function-attrs with the legacy pass manager.

llvm-svn: 263234

2016-03-11 13:53:18 +00:00

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