base: Add a rename helper to SymbolTable
base: Add a rename helper to SymbolTable

In some cases, we want to move and copy the symbol table to another
address. However, the name of symbol table should be unique. This rename
helper provides a way to modify the name of symbol. Developers can use
it to solve the conflict with this helper.

Change-Id: I4627e06da3a03da57009d613188be117c75750a0
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/43105
Reviewed-by: Daniel Carvalho <91779fc734d358d9575ec4910de29bfcbcaf1b22@yahoo.com.br>
Maintainer: Bobby R. Bruce <b9dba908ffb6c6d8ffe449cc88b3709c13c485c2@ucdavis.edu>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

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