[llvm] [DirectX] fix illegal behavior flag in module flags. (PR #96577)

[Chris B via llvm-commits]

================
@@ -0,0 +1,20 @@
+; RUN: opt -S -dxil-prepare < %s | FileCheck %s
+
+; Make sure behavior flag > 6 is fixed.
+; CHECK-NOT: !{i32 7, !"frame-pointer", i32 2}
----------------
llvm-beanz wrote:

This check doesn't seem correct. The code change here doesn't remove the flag it changes the behavior value. We should check for the updated behavior not check that the old behavior doesn't exist.

https://github.com/llvm/llvm-project/pull/96577