Print uint64_t -debug text correctly on 32-bit hosts

On 32-bit hosts %p can print garbage when given a uint64_t, we should
use %llx instead. This only affects the output of the debugging text
produced by lli.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182209 91177308-0d34-0410-b5e6-96231b3b80d8