[llvm] [BOLT][AArch64] Add indirect call promotion support (PR #184733)

[Alexey Moksyakov via llvm-commits]

yavtuk wrote:

@Jianghibo overall LGTM, thanks for PR. 

The only thing I would like to suggest is split the test into two files: icp.c and icp-inline.c. 
the first one is the following, simple functionality

```
#include <stdio.h>

void hello() {
    printf("hello....\n");
}

void execute(void (*callback)()) {
    callback();
}

int exit_success() {
   return 0;
}

int executeTailCall(int (*callback)()) {
    return callback();
}

int main() {
    execute(hello);

    return executeTailCall(exit_success);
}
```

The second one is your current test with inline option.

But let's wait and see what the rest have to say about it @paschalis-mpeis 

https://github.com/llvm/llvm-project/pull/184733