[SR-3602] Test IRGen/empty_array.sil is failing

[gparker42]

Previous ID	SR-3602
Radar	None
Original Reporter	@gparker42
Type	Bug

Additional Detail from JIRA

Votes	0
Component/s	Compiler
Labels	Bug, IRGen
Assignee	None
Priority	Medium

md5: d97ad6b8edaf41590442936141e9f74a

Issue Description:

Test IRGen/empty_array.sil has not run for some time due to an errant REQUIRES clause. After re-enabling it, it fails.

[gparker42]

Example test failure: http://ci.swift.org/job/swift-PR-Linux/5028/