gdb: make get_msymbol_address a private method of minimal_symbol

get_msymbol_address is only used in minimal_symbol::value_address.  Make
it a private helper method.

Change-Id: I3f30e1b9d89ace6682fb08a7ebb91746db0ccf0f
Approved-By: Tom Tromey <tom@tromey.com>
2 files changed