disable DevDiv_255294 in stress modes. (#17618)

Author: Sergey Andreenko

tests/src/JIT/Regression/JitBlue/DevDiv_255294/DevDiv_255294.csproj

@@ -23,6 +23,8 @@
   <PropertyGroup>
     <DebugType></DebugType>
     <Optimize>True</Optimize>
+    <!-- It hits timeout with R2R and JitStress=1, issue 16573 -->
+    <JitOptimizationSensitive>true</JitOptimizationSensitive>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="DevDiv_255294.cs" />