[BOLT][DWARF] Output DWO files as they are being processed

Changed how we handle writing out .dwo and .dwp files. We now write out DWO
sections sooner and destroy DIEBuilder. This should decrease memory footprint.

Ran on clang-17 build in debug mode with split-dwarf.
before
8:07.49 real,   664.62 user,    69.00 sys,      0 amem, 41601612 mmem
8:07.06 real,   669.60 user,    68.75 sys,      0 amem, 41822588 mmem
8:00.36 real,   664.14 user,    66.36 sys,      0 amem, 41561548 mmem

after
8:21.85 real,   682.23 user,    69.64 sys,      0 amem, 39379880 mmem
8:04.58 real,   671.62 user,    66.50 sys,      0 amem, 39735800 mmem
8:10.02 real,   680.67 user,    67.24 sys,       0 amem, 39662888 mmem

Reviewed By: maksfb

Differential Revision: https://reviews.llvm.org/D151908