[llvm] [symbolizer] Address starting with a plus sign is valid. (PR #135857)

[Ebuka Ezike via llvm-commits]

da-viper wrote:

@jh7370  I could not tell if the existing behaviour was intended since I did not see any response,
I assumed it was not that is why I closed it. 

If it is not the case I can reopen it.  

https://github.com/llvm/llvm-project/pull/135857