Add missing copyright headers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222435 91177308-0d34-0410-b5e6-96231b3b80d8
Make DWARFAcceleratorTable::dump() const.

As dump() methods  should be. To allow that, do not store the DWARFFormValue
objects used for the dump in the header data.

Per Alexey's suggestion!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222436 91177308-0d34-0410-b5e6-96231b3b80d8