rename method to remove any confusion about its usage

src/EditorFeatures/CSharp/SignatureHelp/AbstractCSharpSignatureHelpProvider.cs

@@ -63,7 +63,7 @@ protected static IEnumerable<SymbolDisplayPart> GetSeparatorParts()
 
         protected IList<SymbolDisplayPart> GetAwaitableUsage(IMethodSymbol method, SemanticModel semanticModel, int position)
         {
-            if (method.IsAwaitable(semanticModel, position))
+            if (method.IsAwaitableNonDynamic(semanticModel, position))
             {
                 return method.ToAwaitableParts(SyntaxFacts.GetText(SyntaxKind.AwaitKeyword), "x", semanticModel, position);
             }

src/EditorFeatures/CSharp/SignatureHelp/GenericNameSignatureHelpProvider_Method.cs

@@ -15,7 +15,7 @@ internal partial class GenericNameSignatureHelpProvider
         {
             var result = new List<SymbolDisplayPart>();
 
-            var awaitable = method.GetOriginalUnreducedDefinition().IsAwaitable(semanticModel, position);
+            var awaitable = method.GetOriginalUnreducedDefinition().IsAwaitableNonDynamic(semanticModel, position);
             var extension = method.GetOriginalUnreducedDefinition().IsExtensionMethod();
 
             if (awaitable && extension)

src/EditorFeatures/CSharp/SignatureHelp/InvocationExpressionSignatureHelpProvider_MethodGroup.cs

@@ -123,7 +123,7 @@ private bool IsHiddenBy(IMethodSymbol method1, IMethodSymbol method2)
         {
             var result = new List<SymbolDisplayPart>();
 
-            var awaitable = method.GetOriginalUnreducedDefinition().IsAwaitable(semanticModel, position);
+            var awaitable = method.GetOriginalUnreducedDefinition().IsAwaitableNonDynamic(semanticModel, position);
             var extension = method.GetOriginalUnreducedDefinition().IsExtensionMethod();
 
             if (awaitable && extension)

src/EditorFeatures/VisualBasic/SignatureHelp/InvocationExpressionSignatureHelpProvider.MemberGroup.vb

@@ -64,7 +64,7 @@ Namespace Microsoft.CodeAnalysis.Editor.VisualBasic.SignatureHelp
         End Function
 
         Private Function GetAwaitableDescription(member As ISymbol, semanticModel As SemanticModel, position As Integer) As IList(Of SymbolDisplayPart)
-            If member.IsAwaitable(semanticModel, position) Then
+            If member.IsAwaitableNonDynamic(semanticModel, position) Then
                 Return member.ToAwaitableParts(SyntaxFacts.GetText(SyntaxKind.AwaitKeyword), "r", semanticModel, position)
             End If
 

src/Features/Core/Portable/LanguageServices/SymbolDisplayService/AbstractSymbolDisplayService.AbstractSymbolDescriptionBuilder.cs

@@ -317,7 +317,7 @@ private void AddDescriptionForDynamicType()
 
             private void AddDescriptionForNamedType(INamedTypeSymbol symbol)
             {
-                if (symbol.IsAwaitable(_semanticModel, _position))
+                if (symbol.IsAwaitableNonDynamic(_semanticModel, _position))
                 {
                     AddAwaitablePrefix();
                 }
@@ -480,7 +480,7 @@ private void AddDescriptionForRangeVariable(IRangeVariableSymbol symbol)
             private void AddDescriptionForMethod(IMethodSymbol method)
             {
                 // TODO : show duplicated member case
-                var awaitable = method.IsAwaitable(_semanticModel, _position);
+                var awaitable = method.IsAwaitableNonDynamic(_semanticModel, _position);
                 var extension = method.IsExtensionMethod || method.MethodKind == MethodKind.ReducedExtension;
                 if (awaitable && extension)
                 {

src/Workspaces/Core/Portable/Shared/Extensions/ISymbolExtensions.cs

@@ -875,11 +875,11 @@ public static DocumentationComment GetDocumentationComment(this ISymbol symbol,
         }
 
         /// <summary>
-        /// If the <paramref name="symbol"/> is a method symbol, returns True if the method's return type is "awaitable".
-        /// If the <paramref name="symbol"/> is a type symbol, returns True if that type is "awaitable".
+        /// If the <paramref name="symbol"/> is a method symbol, returns <see langword="true"/> if the method's return type is "awaitable", but not if it's <see langword="dynamic"/>.
+        /// If the <paramref name="symbol"/> is a type symbol, returns <see langword="true"/> if that type is "awaitable".
         /// An "awaitable" is any type that exposes a GetAwaiter method which returns a valid "awaiter". This GetAwaiter method may be an instance method or an extension method.
         /// </summary>
-        public static bool IsAwaitable(this ISymbol symbol, SemanticModel semanticModel, int position)
+        public static bool IsAwaitableNonDynamic(this ISymbol symbol, SemanticModel semanticModel, int position)
         {
             IMethodSymbol methodSymbol = symbol as IMethodSymbol;
             ITypeSymbol typeSymbol = null;