Simple pass that selects classes needed for mix mode
Simple pass that selects classes needed for mix mode

Summary:
As title. We pass once through all the classes and set a flag (next
diff) stating those would be eligable for mix mode. Currently, this is pretty hard
coded, will change in the near feature.

Class selected:
* native templates classes (everything under Lcom/facebook/nativetemplates/) except for those under /fb/ (same main pkg)
* litho framework pkgs (everything under Lcom/facebook/litho/)
* all mount specs (which we know are used during scrolling)

Example:
* we have ~2000 classes: P59626066
* without excluding the /fb/ ones under nativetemplates we get -> P59626068

Reviewed By: minjang, justinjhendrick, dariorussi

Differential Revision: D8130863

fbshipit-source-id: 0d6bfd76c1600baf542134383ec0e7b25aad2887

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