Fix a crasher

Author: CodaFi

validation-test/compiler_crashers/28611-isa-x-val-cast-ty-argument-of-incompatible-type.swift renamed to validation-test/compiler_crashers_fixed/28611-isa-x-val-cast-ty-argument-of-incompatible-type.swift

@@ -5,6 +5,6 @@
 // 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: asserts
 #if0=0