Reduce unnecessary error computation

...during overload resolution.  Based on a trace that was spending 30%
of a (very slow) overload resolution elaborating errors that were then
dropped.

Author: amcasey

src/compiler/checker.ts

@@ -26399,7 +26399,7 @@ namespace ts {
             const isTaggedTemplate = node.kind === SyntaxKind.TaggedTemplateExpression;
             const isDecorator = node.kind === SyntaxKind.Decorator;
             const isJsxOpeningOrSelfClosingElement = isJsxOpeningLikeElement(node);
-            const reportErrors = !candidatesOutArray;
+            const reportErrors = !candidatesOutArray && produceDiagnostics;
 
             let typeArguments: NodeArray<TypeNode> | undefined;