Merge pull request #560 from practicalswift/sourcekit-010-swift-archetypebuilder-addrequirement

[SourceKit] Add test case for crash triggered in swift::ArchetypeBuilder::addRequirement(swift::Requirement const&, swift::RequirementSource)

Author: benlangmuir

validation-test/IDE/crashers/010-swift-archetypebuilder-addrequirement.swift

@@ -0,0 +1,6 @@
+// RUN: not --crash %target-swift-ide-test -code-completion -code-completion-token=A -source-filename=%s
+#^A^#{"
+protocol c{
+func a
+typealias b:c
+typealias e:c