[DWARF] Use PRIx64 instead of 'x' to format 64-bit values

This is a follow-up to r346715. Use PRIx64 to formatted print of 64-bit
value in the `DWARFDebugLoclists::LocationList::dump` to escape problem
on big-endian hosts.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@347049 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed