Replace 'ap' with 'up' suffix in variable names. (NFC)

The `ap` suffix is a remnant of lldb's former use of auto pointers,
before they got deprecated. Although all their uses were replaced by
unique pointers, some variables still carried the suffix.

In r353795 I removed another auto_ptr remnant, namely redundant calls to
::get for unique_pointers. Jim justly noted that this is a good
opportunity to clean up the variable names as well.

I went over all the changes to ensure my find-and-replace didn't have
any undesired side-effects. I hope I didn't miss any, but if you end up
at this commit doing a git blame on a weirdly named variable, please
know that the change was unintentional.

llvm-svn: 353912
diff --git a/lldb/source/API/SBTarget.cpp b/lldb/source/API/SBTarget.cpp
index c7dee63..b863b3d 100644
--- a/lldb/source/API/SBTarget.cpp
+++ b/lldb/source/API/SBTarget.cpp
@@ -1570,7 +1570,7 @@
   lldb::SBModule sb_module;
   TargetSP target_sp(GetSP());
   if (target_sp)
-    sb_module.SetSP(target_sp->GetSharedModule(*module_spec.m_opaque_ap));
+    sb_module.SetSP(target_sp->GetSharedModule(*module_spec.m_opaque_up));
   return sb_module;
 }