Fix parsing of initializer lists with elaborated type specifier.

Now we correctly parse and format:
verifyFormat("struct foo a = { bar };
int n;

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172229 91177308-0d34-0410-b5e6-96231b3b80d8
Fix crash on invalid.

if { foo; }
would previously crash clang-format.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172232 91177308-0d34-0410-b5e6-96231b3b80d8