[Orc] Remove the memory manager argument to addModule, and de-templatize the

[Orc] Remove the memory manager argument to addModule, and de-templatize the
symbol resolver argument.

De-templatizing the symbol resolver is part of the ongoing simplification of
ORC layer API.

Removing the memory management argument (and delegating construction of memory
managers for RTDyldObjectLinkingLayer to a functor passed in to the constructor)
allows us to build JITs whose base object layers need not be compatible with
RTDyldObjectLinkingLayer's memory mangement scheme. For example, a 'remote
object layer' that sends fully relocatable objects directly to the remote does
not need a memory management scheme at all (that will be handled by the remote).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307058 91177308-0d34-0410-b5e6-96231b3b80d8