[DWARF] Do not use PRIx32 for printing uint64_t values

The `DWARFDebugAddrTable::dump` routine prints 32/64-bits addresses.
These values are stored in a vector of `uint64_t` independently of their
original sizes. But `format` function gets format string with PRIx32
suffix in case of 32-bit address size. At least on MIPS 32-bit targets
that leads to incorrect output.

This patch changes formats strings and always use PRIx64 to print
`uint64_t` values.

Differential Revision: http://reviews.llvm.org/D54424

llvm-svn: 346715