Fix writing of object creation expressions with --dump-tree
Fix writing of object creation expressions with --dump-tree

Fixes bug 618784.

tjol/vala-tjol,playya/vala,rvu95/vala,spidermonkdust/vala,GNOME/vala,jessevdk/vala,kamanashisroy/aroop,frida/vala,flobrosch/vala-fixes,flobrosch/vala-fixes,kamanashisroy/aroop,tjol/vala-tjol,Distrotech/vala,Distrotech/vala,jessevdk/vala,GNOME/vala,frida/vala,tjol/vala-tjol,GNOME/vala,spidermonkdust/vala,xdave/pvala,severinh/vala,GNOME/vala,frida/vala,Distrotech/vala,playya/vala,rvu95/vala,frida/vala,frida/vala,severinh/vala,spidermonkdust/vala,rvu95/vala,flobrosch/vala-fixes,playya/vala,jessevdk/vala,severinh/vala,kamanashisroy/aroop