Merge pull request #1191 from practicalswift/swiftc-28247-swift-constraints-constraintsystem-solverscope-solverscope

[swiftc] Add test case for crash triggered in swift::constraints::ConstraintSystem::SolverScope::~SolverScope()

Author: slavapestov

validation-test/compiler_crashers/28247-swift-constraints-constraintsystem-solverscope-solverscope.swift

@@ -0,0 +1,7 @@
+// RUN: not --crash %target-swift-frontend %s -parse
+
+// Distributed under the terms of the MIT license
+// Test case submitted to project by https://github.com/practicalswift (practicalswift)
+// Test case found by fuzzing
+
+{func a(a)class a{var _=a(a{{a{