Avoid boxing Boolean in SyntaxTreeSemanticModel.GetMemberSemanticModel

src/Compilers/VisualBasic/Portable/Compilation/SyntaxTreeSemanticModel.vb

@@ -29,7 +29,7 @@ Namespace Microsoft.CodeAnalysis.VisualBasic
         Private ReadOnly _ignoresAccessibility As Boolean
 
         ' maps from a higher-level binder to an appropriate SemanticModel for the construct (such as a method, or initializer).
-        Private ReadOnly _semanticModelCache As New ConcurrentDictionary(Of Tuple(Of Binder, Boolean), MemberSemanticModel)()
+        Private ReadOnly _semanticModelCache As New ConcurrentDictionary(Of (binder As Binder, ignoresAccessibility As Boolean), MemberSemanticModel)()
 
         Friend Sub New(compilation As VisualBasicCompilation, sourceModule As SourceModuleSymbol, syntaxTree As SyntaxTree, Optional ignoreAccessibility As Boolean = False)
             _compilation = compilation
@@ -135,26 +135,26 @@ Namespace Microsoft.CodeAnalysis.VisualBasic
         End Function
 
         ' PERF: These variables avoid repeated allocation of Func(Of Binder, MemberSemanticModel) in GetMemberSemanticModel
-        Private ReadOnly _methodBodySemanticModelCreator As Func(Of Tuple(Of Binder, Boolean), MemberSemanticModel) = Function(key As Tuple(Of Binder, Boolean)) MethodBodySemanticModel.Create(Me, DirectCast(key.Item1, SubOrFunctionBodyBinder), key.Item2)
-        Private ReadOnly _initializerSemanticModelCreator As Func(Of Tuple(Of Binder, Boolean), MemberSemanticModel) = Function(key As Tuple(Of Binder, Boolean)) InitializerSemanticModel.Create(Me, DirectCast(key.Item1, DeclarationInitializerBinder), key.Item2)
-        Private ReadOnly _attributeSemanticModelCreator As Func(Of Tuple(Of Binder, Boolean), MemberSemanticModel) = Function(key As Tuple(Of Binder, Boolean)) AttributeSemanticModel.Create(Me, DirectCast(key.Item1, AttributeBinder), key.Item2)
+        Private ReadOnly _methodBodySemanticModelCreator As Func(Of (binder As Binder, ignoresAccessibility As Boolean), MemberSemanticModel) = Function(key As (binder As Binder, ignoresAccessibility As Boolean)) MethodBodySemanticModel.Create(Me, DirectCast(key.binder, SubOrFunctionBodyBinder), key.ignoresAccessibility)
+        Private ReadOnly _initializerSemanticModelCreator As Func(Of (binder As Binder, ignoresAccessibility As Boolean), MemberSemanticModel) = Function(key As (binder As Binder, ignoresAccessibility As Boolean)) InitializerSemanticModel.Create(Me, DirectCast(key.binder, DeclarationInitializerBinder), key.ignoresAccessibility)
+        Private ReadOnly _attributeSemanticModelCreator As Func(Of (binder As Binder, ignoresAccessibility As Boolean), MemberSemanticModel) = Function(key As (binder As Binder, ignoresAccessibility As Boolean)) AttributeSemanticModel.Create(Me, DirectCast(key.binder, AttributeBinder), key.ignoresAccessibility)
 
         Public Function GetMemberSemanticModel(binder As Binder) As MemberSemanticModel
 
             If TypeOf binder Is MethodBodyBinder Then
-                Return _semanticModelCache.GetOrAdd(Tuple.Create(binder, IgnoresAccessibility), _methodBodySemanticModelCreator)
+                Return _semanticModelCache.GetOrAdd((binder, IgnoresAccessibility), _methodBodySemanticModelCreator)
             End If
 
             If TypeOf binder Is DeclarationInitializerBinder Then
-                Return _semanticModelCache.GetOrAdd(Tuple.Create(binder, IgnoresAccessibility), _initializerSemanticModelCreator)
+                Return _semanticModelCache.GetOrAdd((binder, IgnoresAccessibility), _initializerSemanticModelCreator)
             End If
 
             If TypeOf binder Is AttributeBinder Then
-                Return _semanticModelCache.GetOrAdd(Tuple.Create(binder, IgnoresAccessibility), _attributeSemanticModelCreator)
+                Return _semanticModelCache.GetOrAdd((binder, IgnoresAccessibility), _attributeSemanticModelCreator)
             End If
 
             If TypeOf binder Is TopLevelCodeBinder Then
-                Return _semanticModelCache.GetOrAdd(Tuple.Create(binder, IgnoresAccessibility), _methodBodySemanticModelCreator)
+                Return _semanticModelCache.GetOrAdd((binder, IgnoresAccessibility), _methodBodySemanticModelCreator)
             End If
 
             Return Nothing