VB Unstructured Exception Handling: Finish work to comply with requirement...

VB Unstructured Exception Handling: Finish work to comply with requirement that IL shall only differ between Release and Debug. Enable/fix all Unstructured Exception Handling unit-tests.
***NO_CI***
 (changeset 1386638)

Src/Compilers/VisualBasic/Portable/Lowering/LocalRewriter/LocalRewriter.vb

@@ -135,6 +135,12 @@ Namespace Microsoft.CodeAnalysis.VisualBasic
             Me.Flags = flags
         End Sub
 
+        Public ReadOnly Property OptimizationLevelIsDebug As Boolean
+            Get
+                Return Me.Compilation.Options.OptimizationLevel = OptimizationLevel.Debug
+            End Get
+        End Property
+
         Private Shared Function RewriteNode(node As BoundNode,
                                             topMethod As MethodSymbol,
                                             currentMethod As MethodSymbol,

Src/Compilers/VisualBasic/Portable/Lowering/LocalRewriter/LocalRewriter_If.vb

@@ -44,7 +44,7 @@ Namespace Microsoft.CodeAnalysis.VisualBasic
                         Dim asMultiline = DirectCast(syntax, MultiLineIfBlockSyntax)
                         conditionSyntax = asMultiline.IfStatement
                         newConsequence = InsertBlockEpilogue(newConsequence,
-                                                             If(generateUnstructuredExceptionHandlingResumeCode,
+                                                             If(generateUnstructuredExceptionHandlingResumeCode AndAlso (OptimizationLevelIsDebug OrElse finishConsequenceWithResumeTarget),
                                                                 RegisterUnstructuredExceptionHandlingNonThrowingResumeTarget(newConsequence.Syntax),
                                                                 Nothing),
                                                              asMultiline.EndIfStatement)
@@ -54,7 +54,7 @@ Namespace Microsoft.CodeAnalysis.VisualBasic
                         Dim asElseIfBlock = DirectCast(syntax, ElseIfBlockSyntax)
                         conditionSyntax = asElseIfBlock.ElseIfStatement
                         newConsequence = InsertBlockEpilogue(newConsequence,
-                                                             If(generateUnstructuredExceptionHandlingResumeCode,
+                                                             If(generateUnstructuredExceptionHandlingResumeCode AndAlso (OptimizationLevelIsDebug OrElse finishConsequenceWithResumeTarget),
                                                                 RegisterUnstructuredExceptionHandlingNonThrowingResumeTarget(newConsequence.Syntax),
                                                                 Nothing),
                                                              DirectCast(syntax.Parent, MultiLineIfBlockSyntax).EndIfStatement)
@@ -80,7 +80,7 @@ Namespace Microsoft.CodeAnalysis.VisualBasic
                     If asElse IsNot Nothing Then
                         ' Update the resume table to make sure that we are in the right scope when we Resume Next on [End If].
                         newAlternative = InsertBlockEpilogue(newAlternative,
-                                                             If(generateUnstructuredExceptionHandlingResumeCode,
+                                                             If(generateUnstructuredExceptionHandlingResumeCode AndAlso OptimizationLevelIsDebug,
                                                                 RegisterUnstructuredExceptionHandlingNonThrowingResumeTarget(newAlternative.Syntax),
                                                                 Nothing),
                                                              DirectCast(asElse.Parent, MultiLineIfBlockSyntax).EndIfStatement)

Src/Compilers/VisualBasic/Portable/Lowering/LocalRewriter/LocalRewriter_UnstructuredExceptionHandling.vb

@@ -227,7 +227,7 @@ Namespace Microsoft.CodeAnalysis.VisualBasic
             ' Determine if the handler index is less than or equal to -2 (ActiveHandler_FirstOnErrorResumeNextIndex):
             ' If so, replace it with ActiveHandler_ResumeNext and jump to the switch.
             statements.Add(New BoundUnstructuredExceptionOnErrorSwitch(node.Syntax,
-                                                                       If(node.ResumeWithoutLabelOpt IsNot Nothing AndAlso Me.Compilation.Options.OptimizationLevel = OptimizationLevel.Debug,
+                                                                       If(node.ResumeWithoutLabelOpt IsNot Nothing AndAlso OptimizationLevelIsDebug,
                                                                           nodeFactory.Conditional(nodeFactory.Binary(BinaryOperatorKind.GreaterThan,
                                                                                                                      bool,
                                                                                                                      nodeFactory.Local(unstructuredExceptionHandling.ActiveHandlerTemporary, isLValue:=False),
@@ -347,7 +347,7 @@ Namespace Microsoft.CodeAnalysis.VisualBasic
                     unstructuredExceptionHandling.ExceptionHandlers.Add(nodeFactory.Goto(node.LabelOpt, setWasCompilerGenerated:=False))
 
                 Case OnErrorStatementKind.ResumeNext
-                    If Compilation.Options.OptimizationLevel = OptimizationLevel.Debug Then
+                    If OptimizationLevelIsDebug Then
                         newErrorHandlerIndex = ActiveHandler_FirstOnErrorResumeNextIndex - unstructuredExceptionHandling.OnErrorResumeNextCount
                     Else
                         newErrorHandlerIndex = ActiveHandler_ResumeNext