[llvm] [BOLT] fix print-mem-data not working (PR #156332)

[Haibo Jiang via llvm-commits]

Jianghibo wrote:

> Thanks for your patch @Jianghibo.
> 
> Could you add a small test to acompany the patch? Also see some comment below.

Added the test case. Since `link_fdata` cannot parse the memory access profile, I used an independent fdata to store memory access data.

https://github.com/llvm/llvm-project/pull/156332