Partially revert '[MachO] Update embedded part of ObjectFileMachO for Mangled API change'

Commit f3aa9e36 fixed the embedded OS
build by removing all passed args for `GetName`/`GetDemangledName`. The motivation
for this was that these arguments were apparently removed in
commit 22b04487. However, only `GetName`'s language
argument was removed but the mangling preference argument was *not* removed
(and unfortunately had a default argument). So when that commit removed all
the args it didn't just fix the build but it also changed all the mangling
preferences to 'demangled' for all `GetName` calls.

Also some `GetName` calls were outside the TARGET_OS_EMBEDDED ifdef, so
this change ended up breaking the following tests on macOS:

  lldb-api :: lang/objc/objc-static-method-stripped/TestObjCStaticMethodStripped.py
  lldb-api :: lang/objc/objc-super/TestObjCSuper.py

From what I can see f3aa9e36 removed 12 ePreferMangled args and this patch
re-adds 12 args with roughly the same line numbers, so this *should* restore the
old behaviour and also keep the embedded build working. On the other hand,
ObjectFileMachO::ParseSymtab is a very successful attempt at writing
the longest possible function within LLVM, so this fix is partly based
on the engineering principle known as "hoping for the best".