Merge pull request #6066 from gparker42/disable-28555

Author: swift-ci

validation-test/compiler_crashers/28555-unreachable-executed-at-swift-lib-ast-type-cpp-1318.swift

@@ -5,6 +5,9 @@
 // See https://swift.org/LICENSE.txt for license information
 // See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
 
+// FIXME: Disabled. This test does not always crash, which confuses CI.
+// REQUIRES: y-u-not-crash-always
+
 // REQUIRES: OS=linux-gnu
 // RUN: not --crash %target-swift-frontend %s -emit-ir
 _&[i