[llvm] [LLVM][DWARF] Add compilation directory and dwo name to TU in dwo section (PR #74909)

[Alexander Yermolovich via llvm-commits]

ayermolo wrote:

>From clang-18.dwp
With change:
[ 7] .debug_info.dwo   PROGBITS        0000000000000000 202db7b1 4e5076d4 00   E  0   0  1
Without change:
[ 7] .debug_info.dwo   PROGBITS        0000000000000000 202d78b3 4e4f5985 00   E  0   0  1

DIff 73039 bytes.

https://github.com/llvm/llvm-project/pull/74909