Fabric: Fixed bug in RCTSurfaceTouchHandler::PointerHasher
Fabric: Fixed bug in RCTSurfaceTouchHandler::PointerHasher

Summary:
Without this fix the PointerHasher hashed not a pointer, but an address where the pointer is stored, which is obviously incorrect.
The incorrect hash function compromised the whole `_activeTouches` caused many issues with logically invalid invariants (e.g. removing element from the collection silently didn't work).

Reviewed By: mdvacca

Differential Revision: D13072804

fbshipit-source-id: d68289e940fe21e2df08a31439619b7e2fe0fa13

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