Add validation of shared constructor IL in VB...

src/Compilers/VisualBasic/Test/Emit/Emit/DynamicAnalysis/DynamicInstrumentationTests.vb

@@ -140,6 +140,21 @@ True
   IL_0036:  ldc.i4.1
   IL_0037:  stelem.i1
   IL_0038:  ret
+}
+                ]]>.Value)
+            verifier.VerifyIL(
+                ".cctor",
+            <![CDATA[
+{
+  // Code size       31 (0x1f)
+  .maxstack  1
+  IL_0000:  ldtoken    Max Method Token Index
+  IL_0005:  newarr     "Boolean()"
+  IL_000a:  stsfld     "Boolean()() <PrivateImplementationDetails>.PayloadRoot0"
+  IL_000f:  ldstr      ##MVID##
+  IL_0014:  newobj     "Sub System.Guid..ctor(String)"
+  IL_0019:  stsfld     "System.Guid <PrivateImplementationDetails>.MVID"
+  IL_001e:  ret
 }
                 ]]>.Value)
             verifier.VerifyDiagnostics()