Merge pull request #6596 from practicalswift/swiftc-28614-args-size-fnref-getnumargumentsforfullapply-partial-application-was-throwing

[swiftc (37 vs. 5390)] Add crasher in swift::ASTVisitor

Author: practicalswift

validation-test/compiler_crashers/28614-args-size-fnref-getnumargumentsforfullapply-partial-application-was-throwing.swift

@@ -0,0 +1,10 @@
+// This source file is part of the Swift.org open source project
+// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+
+// RUN: not --crash %target-swift-frontend %s -emit-ir
+// REQUIRES: asserts
+func a{guard let[]=(a||()A