Adding Unit tests for IfStatement (#18060)

* Adding Unit tests for IfStatement

* Addressing PR feedback

* Addressing pr feedback

* Adding implicit embedded statement test case

src/Compilers/CSharp/Test/Semantic/CSharpCompilerSemanticTest.csproj

@@ -59,6 +59,7 @@
     <Compile Include="Diagnostics\DiagnosticAnalyzerTests.AllInOne.cs" />
     <Compile Include="Diagnostics\DiagnosticAnalyzerTests.cs" />
     <Compile Include="Diagnostics\GetDiagnosticsTests.cs" />
+    <Compile Include="IOperation\IOperationTests_IIfStatement.cs" />
     <Compile Include="IOperation\IOperationTests_ISymbolInitializer.cs" />
     <Compile Include="IOperation\IOperationTests.cs" />
     <Compile Include="Diagnostics\OperationAnalyzerTests.cs" />

src/Compilers/VisualBasic/Test/Semantic/BasicCompilerSemanticTest.vbproj

@@ -96,6 +96,7 @@
     <Compile Include="Diagnostics\DiagnosticAnalyzerTests.vb" />
     <Compile Include="Diagnostics\DiagnosticTests.vb" />
     <Compile Include="Diagnostics\GetDiagnosticsTests.vb" />
+    <Compile Include="IOperation\IOperationTests_IIfStatement.vb" />
     <Compile Include="IOperation\IOperationTests_ISymbolInitializer.vb" />
     <Compile Include="IOperation\IOperationTests.vb" />
     <Compile Include="Diagnostics\OperationAnalyzerTests.vb" />