Sema: Fix infinite loop in OrderDeclarations::operator() [6.3] #85657
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6.3 cherry-pick of #85656.
Description: If the two declarations were in different source files, we would get stuck in the while loop at the end.
Scope of the issue: Compiler would hang when attempting to diagnose
@objcselector conflict in WMO build with multiple source files.Origination: Looks like this was introduced in 6.1 with 07b9fe9.
Radar: rdar://164519548.
Risk: Very low.
Reviewed by: @DougGregor