Fix parsing new expressions using init lists. Probably still do the wrong thing in...

Fix parsing new expressions using init lists. Probably still do the wrong thing in cases involving array new.
Show that many cases using initializer list constructors work, in that they parse and pass semantic analysis.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150316 91177308-0d34-0410-b5e6-96231b3b80d8