Don't default print comments for JSXFragments (#3398)

src/printer.js

@@ -5105,7 +5105,7 @@ function printAstToDoc(ast, options, addAlignmentSize) {
     // UnionTypeAnnotation has to align the child without the comments
     let res;
     if (
-      ((node && node.type === "JSXElement") ||
+      ((node && isJSXNode(node)) ||
         (parent &&
           (parent.type === "JSXSpreadAttribute" ||
             parent.type === "JSXSpreadChild" ||

tests/jsx_fragment/__snapshots__/jsfmt.spec.js.snap

@@ -33,6 +33,11 @@ exports[`fragment.js 1`] = `
   </>
 </div>;
 
+foo = (
+  // comment
+  <></>
+);
+
 </* open fragment */>
   <Component />
   <Component />
@@ -75,6 +80,11 @@ exports[`fragment.js 1`] = `
   </>
 </div>;
 
+foo = (
+  // comment
+  <></>
+);
+
 </* open fragment */>
   <Component />
   <Component />

tests/jsx_fragment/fragment.js

@@ -30,6 +30,11 @@
   </>
 </div>;
 
+foo = (
+  // comment
+  <></>
+);
+
 </* open fragment */>
   <Component />
   <Component />