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/0266-swift-parser-parseexprorstmt.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
+
+var f = 1
+var e: Int -> Int = {
+    return $0
+}
+let Void>]()
+    func call(#object1: AnyObject, object2: AnyObject) {
+        for b in a {
+            b.c(object1, object2)
+        }
+    }
+}
+private class B<C> {
+    let c: C
+    init(c: C) {
+      > {
+    l
+        }
+    }
+}
+func b(c) -> <d>(() -> d) {
+}
+im