Don't use a function-scope static varaibles in
RegisterContextLLDB::SavedLocationForRegister to cache the pc and
sp register numbers -- if lldb is debugging multiple Targets of
different architectures, this will be incorrect.  If these were
to be cached anywhere, it would have to be up in the Target.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@186651 91177308-0d34-0410-b5e6-96231b3b80d8