Wanyi 5a8f290ded [llvm-gsymutil] Print one-time DWO file missing warning under --quiet flag (#79882) ...

FileCheck test added
```
./bin/llvm-lit -sv llvm/test/tools/llvm-gsymutil/X86/elf-dwo.yaml
```

Manual test steps:

- Create binary with split-dwarf:
```
clang++ -g -gdwarf-4 -gsplit-dwarf main.cpp -o main_split
```

- Remove or remane the dwo file to a different name so llvm-gsymutil can't find it
```
mv main_split-main.dwo main_split-main__.dwo
```

- Now run llvm-gsymutil conversion, it should print out warning with and
without the `--quiet` flag
```
$ ./bin/llvm-gsymutil --convert=./main_split
Input file: ./main_split
Output file (x86_64): ./main_split.gsym
warning: Unable to retrieve DWO .debug_info section for main_split-main.dwo
Loaded 0 functions from DWARF.
Loaded 12 functions from symbol table.
Pruned 0 functions, ended with 12 total
```

```
$ ./bin/llvm-gsymutil --convert=./main_split --quiet
Input file: ./main_split
Output file (x86_64): ./main_split.gsym
warning: Unable to retrieve DWO .debug_info section for some object files. (Remove the --quiet flag for full output)
Pruned 0 functions, ended with 12 total
```

2024-02-01 00:34:03 -05:00

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