Merge pull request #720 from practicalswift/sourcekit-056-swift-archetypebuilder-getallarchetypes

[SourceKit] Add test case for crash triggered in swift::ArchetypeBuilder::getAllArchetypes()

Author: gribozavr

validation-test/IDE/crashers/056-swift-archetypebuilder-getallarchetypes.swift

@@ -0,0 +1,9 @@
+// RUN: not --crash %target-swift-ide-test -code-completion -code-completion-token=A -source-filename=%s
+// REQUIRES: asserts
+var e{
+protocol A{
+func b:e protocol e{
+typealias e:e:protocol e{
+enum a{
+func a<d{func b<a
+protocol c:#^A^#