API to check for side effects in a region

[Cao, Joshua]

Is there an API to check for side effects in a region? One simple way to check that the number of uses is only one:


https://github.com/openjdk/jdk/blob/f31957e6a1c463e5c7041bf4eee4a1b09048e929/src/hotspot/share/opto/ifnode.cpp#L1253


But this is conservative. There can be Loads and Casts, which are not side effects.


Also, why do casts need explicit region node inputs? I feel like its unnecessary. Its place in the graph should be implicit.
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