Added 25 new crash cases found by fuzzing.
Added test case 269-swift-irgen-irgenmodule-emitsilfunction.swift
Typo: added missing newline.
Now warning about duplicate ids.
Added test cases:
* 270-swift-arraysemanticcall-hoistorcopy.swift
* 271-swift-irgen-irgenfunction-emittypemetadataref.swift
Updated crash stack traces.
Moved crash duplicates.
Renamed files.
Moved duplicate test case.
Removed trailing newline
Moved duplicate test case.
Adjusted how crash checksums are calculated.
Moved duplicate crash case
Merge remote-tracking branch 'upstream/master'