Add a repro test.

src/tests/JIT/Regression/JitBlue/Runtime_44266/Runtime_44266.il

@@ -0,0 +1,55 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+// This test shows an inlining of `byref LCL_VAR_ADDR - byref CNST_INT` method that returns a native int.
+// However, Jit could try to optimize `-` as `+ -CNST_INT` that could lead to an incorrect `long + (-byref)`.
+
+.assembly extern System.Console {}
+.assembly extern legacy library mscorlib {}
+.assembly byrefsubbyref1 { }
+.class a extends [mscorlib]System.Object
+{
+  .field static class ctest S_1
+  .method public static native int byrefsubbyref(class ctest& V_1, class ctest& V_2) aggressiveinlining
+  {
+    ldarg 0
+    ldarg 1
+    sub
+    ret
+  }
+
+  .method public static int32 main() cil managed
+  {
+    .entrypoint
+    .maxstack  2
+    .locals init (class ctest V_1,
+             class ctest V_2,
+             native int V_3)
+    newobj     instance void ctest::.ctor()
+    stloc.0
+    newobj     instance void ctest::.ctor()
+    dup
+    stsfld class ctest a::S_1
+    stloc.1
+
+    ldloca V_1
+    ldsflda class ctest a::S_1
+    call native int a::byrefsubbyref(class ctest&, class ctest&)
+    stloc V_3
+    ldloc V_3
+    ret
+  }
+}
+
+.class private auto ansi ctest
+       extends [mscorlib]System.Object
+{
+  .method public specialname rtspecialname 
+          instance void  .ctor() cil managed
+  {
+    .maxstack  1
+    ldarg.0
+    call       instance void [mscorlib]System.Object::.ctor()
+    ret
+  } 
+}

src/tests/JIT/Regression/JitBlue/Runtime_44266/Runtime_44266.ilproj

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+<Project Sdk="Microsoft.NET.Sdk.IL">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+  </PropertyGroup>
+  <PropertyGroup>
+    <DebugType />
+    <Optimize>True</Optimize>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="$(MSBuildProjectName).il" />
+  </ItemGroup>
+</Project>