Change the way we output templates for JSON AST dumping and dump information about...

Change the way we output templates for JSON AST dumping and dump information about template arguments.

Previously, we attempted to write out template parameters and specializations to their own array, but due to the architecture of the ASTNodeTraverser, this meant that other nodes were not being written out. This now follows the same behavior as the regular AST dumper and puts all the (correct) information into the "inner" array. When we correct the AST node traverser itself, we can revisit splitting this information into separate arrays again.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@363819 91177308-0d34-0410-b5e6-96231b3b80d8