Update WaveMatrix test shader model requirement to 6.9 (#6169)

WaveMatrix is moved out of SM 6.8, so the requirement in the test needs
to be updated to SM 6.9 to exclude the test from execution until at
least experimental SM 6.9 is supported by the device.

tools/clang/unittests/HLSLExec/ExecutionTest.cpp

@@ -649,9 +649,10 @@ public:
     D3D_SHADER_MODEL_6_6 = 0x66,
     D3D_SHADER_MODEL_6_7 = 0x67,
     D3D_SHADER_MODEL_6_8 = 0x68,
+    D3D_SHADER_MODEL_6_9 = 0x69,
   } D3D_SHADER_MODEL;
 
-  static const D3D_SHADER_MODEL HIGHEST_SHADER_MODEL = D3D_SHADER_MODEL_6_8;
+  static const D3D_SHADER_MODEL HIGHEST_SHADER_MODEL = D3D_SHADER_MODEL_6_9;
 
   bool UseDxbc() {
 #ifdef _HLK_CONF
@@ -752,7 +753,7 @@ public:
         WEX::TestExecution::VerifyOutputSettings::LogOnlyFailures);
 
     CComPtr<ID3D12Device> pDevice;
-    D3D_SHADER_MODEL model = D3D_SHADER_MODEL_6_8;
+    D3D_SHADER_MODEL model = D3D_SHADER_MODEL_6_9;
 
     if (!CreateDevice(&pDevice, model)) {
       return nullptr;