Summary:
This change makes so that processing stack trace before sending it to packager (see 7dbc805)
doesn't modify original frames but creates a copies instead.
This is required because after some changes that also have been landed in 0.35, frames that arrive to
'symbolicateStackTrace' are already frozen, so changing 'file' property of the original frame causes
symbolication to fail.
Closes https://github.com/facebook/react-native/pull/10655
Differential Revision: D4110273
fbshipit-source-id: 0302694b520d83a79c3cb67903038b3f494315f2