[llvm] [BOLT] Fix LLVM_APPEND_VC_REV support (PR #142410)

[Paschalis Mpeis via llvm-commits]

paschalis-mpeis wrote:

### Details regarding the NFC checks ([llvm-zorg](https://github.com/llvm/llvm-zorg/blob/main/zorg/buildbot/builders/BOLTBuilder.py#L105)):

One of the nfc-test issues is due to a BOLT SHA mismatch. The problem isn't actually in the `bolt_info` section. That section does not end up in the final `build/bin/llvm-bolt`, regardless of whether `LLVM_APPEND_VC_REV` is used. For example:

```bash
# section not present
$ llvm-objdump -s -j .note.bolt_info build/bin/llvm-bolt


llvm-objdump: warning: .. not found in any input file
```

However, there is a mismatch , in a `.rodata` [literal](https://github.com/llvm/llvm-project/blob/0289ca09bebe16c6e93dc13df6c293529fb1ee77/bolt/lib/Utils/CommandLineOpts.cpp#L20). This patch should fix it.

@aaupov, in the coming days I'll publish more patches, adjusting both bolt and llvm-zorg.

https://github.com/llvm/llvm-project/pull/142410