Note a fixed compiler crasher

Author: DougGregor

validation-test/compiler_crashers/28653-child-source-range-not-contained-within-its-parent.swift renamed to validation-test/compiler_crashers_fixed/28653-child-source-range-not-contained-within-its-parent.swift

@@ -5,7 +5,7 @@
 // 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
+// RUN: not %target-swift-frontend %s -emit-ir
 // REQUIRES: swift_ast_verifier
 
 switch{case.b(u){