Import the swift-compiler-crashes test suite.

Add all compiler crash tests to the validation-test/compiler_crashers
subdirectory. Add a RUN: line to each test case according to the current
behavior of the Swift compiler.

Swift SVN r23418

validation-test/compiler_crashers/0113-swift-constraints-constraintsystem-solve.swift

@@ -0,0 +1,28 @@
+// RUN: not %swift %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
+
+ []
+}
+protocol p {
+}
+protocol g : p {
+}
+n    j  }
+}
+protocol k {
+   class func q()
+}
+class n: k{  class func q {}
+func r<e: t, s where j<s> == e.m { func g
+k q<n : t> {
+    q g: n
+}
+func p<n>() -> [q<n>] {
+    o : g.l) {
+    }
+}
+class p {
+    typealias g = g