[llvm-objcopy] Reland "Fix --add-section when section contain empty bytes"

Implicit cast between char* and StringRef when writing sections.

Reproduce:
```
$> llvm-objcopy --dump-section=name=name.data out.wasm
$> llvm-objcopy --remove-section=name out.wasm out_no_name.wasm
$> llvm-objcopy --add-section=name=name.data out_no_name.wasm out_new_name.wasm

```

Reviewed By: dschuff

Differential Revision: https://reviews.llvm.org/D139210