goto-def should treat constructor functions as functions

src/services/goToDefinition.ts

@@ -241,7 +241,7 @@ namespace ts.GoToDefinition {
         function getConstructSignatureDefinition(): DefinitionInfo[] | undefined {
             // Applicable only if we are in a new expression, or we are on a constructor declaration
             // and in either case the symbol has a construct signature definition, i.e. class
-            if (symbol.flags & SymbolFlags.Class && (isNewExpressionTarget(node) || node.kind === SyntaxKind.ConstructorKeyword)) {
+            if (symbol.flags & SymbolFlags.Class && !(symbol.flags & SymbolFlags.Function) && (isNewExpressionTarget(node) || node.kind === SyntaxKind.ConstructorKeyword)) {
                 const cls = find(filteredDeclarations, isClassLike) || Debug.fail("Expected declaration to have at least one class-like declaration");
                 return getSignatureDefinition(cls.members, /*selectConstructors*/ true);
             }

tests/cases/fourslash/gotoDefinitionConstructorFunction.ts

@@ -0,0 +1,15 @@
+/// <reference path="fourslash.ts" />
+// @allowJs: true
+// @checkJs: true
+// @noEmit: true
+// @filename: gotoDefinitionConstructorFunction.js
+//// function /*end*/StringStreamm() {
+//// }
+//// StringStreamm.prototype = {
+//// };
+////
+//// function runMode () {
+//// new [|/*start*/StringStreamm|]()
+//// };
+
+verify.goToDefinition('start', 'end')