Fix#54456: `objcopy --only-keep-debug` produces a linked image with invalid
empty dynamic section. llvm-objdump -p currently reports an error which seems
excessive.
```
% llvm-readelf -l a.out
llvm-readelf: warning: 'a.out': no valid dynamic table was found
...
```
Follow the spirit of llvm-readelf -l (D64472) and report a warning instead.
This allows later files to be dumped despite warnings for an input file, and
improves objdump compatibility in that the exit code is now 0 instead of 1.
```
% llvm-objdump -p a.out # new behavior
...
Program Header:
llvm-objdump: warning: 'a.out': invalid empty dynamic section
% objdump -p a.out
...
Dynamic Section:
```
Reviewed By: jhenderson, raj.khem
Differential Revision: https://reviews.llvm.org/D122505
llvm-objdump had some missing coverage that is fixed by this change:
- A test specifically for --print-imm-hex, and coverage of --no-print-imm-hex
- section-headers.test checks the aliases --headers or --section-headers
- A test for the use of --private-headers for ELF that checks the output
- A test for ELF program headers
Differential Revision: https://reviews.llvm.org/D103974
Fangrui Song