Fabric: Fixed issue in the diffing algorithm
Fabric: Fixed issue in the diffing algorithm

Summary:
Previously we generated `removed` *or* `delete` instruction, but sometimes we have to generate both.
So, basically we did it wrong. :(

Reviewed By: mdvacca

Differential Revision: D7503386

fbshipit-source-id: 8ee476abd29f088f31dc776f6e6a68d5293fbb35

exponent/react-native,janicduplessis/react-native,exponentjs/react-native,arthuralee/react-native,hoangpham95/react-native,janicduplessis/react-native,hammerandchisel/react-native,janicduplessis/react-native,janicduplessis/react-native,javache/react-native,javache/react-native,javache/react-native,pandiaraj44/react-native,exponentjs/react-native,myntra/react-native,hammerandchisel/react-native,javache/react-native,exponentjs/react-native,javache/react-native,myntra/react-native,facebook/react-native,facebook/react-native,exponentjs/react-native,javache/react-native,facebook/react-native,facebook/react-native,myntra/react-native,hoangpham95/react-native,exponent/react-native,exponentjs/react-native,hoangpham95/react-native,hoangpham95/react-native,exponentjs/react-native,facebook/react-native,exponent/react-native,hammerandchisel/react-native,facebook/react-native,pandiaraj44/react-native,pandiaraj44/react-native,pandiaraj44/react-native,janicduplessis/react-native,hoangpham95/react-native,myntra/react-native,hammerandchisel/react-native,javache/react-native,pandiaraj44/react-native,hoangpham95/react-native,exponent/react-native,javache/react-native,pandiaraj44/react-native,myntra/react-native,myntra/react-native,hoangpham95/react-native,janicduplessis/react-native,janicduplessis/react-native,exponent/react-native,hammerandchisel/react-native,arthuralee/react-native,janicduplessis/react-native,hammerandchisel/react-native,pandiaraj44/react-native,arthuralee/react-native,myntra/react-native,myntra/react-native,exponentjs/react-native,facebook/react-native,hoangpham95/react-native,arthuralee/react-native,exponentjs/react-native,hammerandchisel/react-native,pandiaraj44/react-native,exponent/react-native,facebook/react-native,exponent/react-native,exponent/react-native,facebook/react-native,arthuralee/react-native,hammerandchisel/react-native,javache/react-native,myntra/react-native