isDynamicName skips parentheses for element access

Neither `x[0]` nor `x[(0)]` should be dynamic names. Previously, the
latter was because `isDynamicName` didn't skip parentheses.

Since the binder treats dynamic names in property assignments as
assignment declarations, this incorrectly tried to create a binding for
expressions like `x[(0)] = 1`.

This caused an assert because `x[(0)]` would not take the dynamic name
code path during binding (`hasDynamicName` returned false), but the
normal code path for static names.

src/compiler/utilities.ts

@@ -3061,7 +3061,7 @@ namespace ts {
         if (!(name.kind === SyntaxKind.ComputedPropertyName || name.kind === SyntaxKind.ElementAccessExpression)) {
             return false;
         }
-        const expr = isElementAccessExpression(name) ? name.argumentExpression : name.expression;
+        const expr = isElementAccessExpression(name) ? skipParentheses(name.argumentExpression) : name.expression;
         return !isStringOrNumericLiteralLike(expr) &&
             !isSignedNumericLiteral(expr) &&
             !isWellKnownSymbolSyntactically(expr);