Correctly parse braced member initializers (even in delayed parsing) and correctly...

Correctly parse braced member initializers (even in delayed parsing) and correctly pass
the information on to Sema. There's still an incorrectness in the way template instantiation
works now, but that is due to a far larger underlying representational problem.
Also add a test case for various list initialization cases of scalars, which test this
commit as well as the previous one.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@140460 91177308-0d34-0410-b5e6-96231b3b80d8