[dsymutil] Improve verbose output (NFC)

The verbose output for finding relocations assumed that we'd always dump
the DIE after (which starts with a newline) and therefore didn't include
one itself. However, this isn't always true, leading to garbled output.

This patch adds a newline to the verbose output and adds a line that
says that the DIE is being kept (which isn't obvious otherwise). It also
adds a 0x prefix to the relocations.

llvm-svn: 374123