[llvm] [RFC][BOLT] Enable lite mode by default on AArch64 (PR #205545)

[Alexandros Lamprineas via llvm-commits]

labrinea wrote:

I have a local build that mirrors the configuration of the upstream builder [bolt-aarch64-ubuntu-clang](https://lab.llvm.org/buildbot/#/builders/128). After we enabled lite mode by default clang-bolt has been failing for me (but not for the builder) with:
```
BOLT-ERROR: JITLink failed: In graph in-memory object file, section .local.text.__BP_402: relocation target 0x9cd6b40 (<anonymous symbol>:0x9000000 + 0xcd6b40) is out of range of ADRLiteral21 fixup at address 0x9000000 (__BP_402, 0x40d8884 + 0x0)
```
this is on a graviton4 instance with ubuntu 22 and gcc11, the upstream builder is using gcc13. It could be that, I am not sure.

https://github.com/llvm/llvm-project/pull/205545