Xin Tong fd353df19e Remove some of unneeded functionality in CallerAnalysis ...

We really only need the analysis to tell whether a function has caller
inside the module or not. We do not need to know the callsites.

Remove them for now to make the analysis more memory efficient.

Add a note to indicate it can be extended.

2016-03-17 21:16:24 -07:00

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