Import latest compiler crashers from practicalswift

68% are already fixed, including all those marked as beta 4 regressions.

Swift SVN r30914

validation-test/compiler_crashers_fixed/26708-swift-parser-parseversiontuple.swift

@@ -0,0 +1,20 @@
+// RUN: not %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
+
+protocol A{enum S<T{
+func a
+let en=a[{
+}
+class a{
+let e ={
+{
+}
+class A{
+let s= {extension{
+}}
+func a
+}
+}}}
+let:A