Merge pull request #774 from practicalswift/sourcekit-061-swift-constraints-solution-coercetotype

[SourceKit] Add test case for crash triggered in swift::constraints::Solution::coerceToType(…)

Author: gribozavr

validation-test/IDE/crashers/061-swift-constraints-solution-coercetotype.swift

@@ -0,0 +1,12 @@
+// RUN: not --crash %target-swift-ide-test -code-completion -code-completion-token=A -source-filename=%s
+// REQUIRES: asserts
+protocol P{
+protocol A{
+let t={
+protocol c{
+let:n
+class A{
+func c
+let s=c
+protocol e{
+typealias f=#^A^#