Bug 1419781: Render a supplementary space when exporting a wasm global; r=lth

MozReview-Commit-ID: Jr6efdRVBGE

--HG--
extra : amend_source : 8dcc037e1ba80c2cb28743caaeb861cab48b2a36

js/src/wasm/WasmBinaryToText.cpp

@@ -1748,7 +1748,7 @@ RenderExport(WasmRenderContext& c, AstExport& export_,
         break;
       }
       case DefinitionKind::Global: {
-        if (!c.buffer.append("global"))
+        if (!c.buffer.append("global "))
             return false;
         if (!RenderRef(c, export_.ref()))
             return false;