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/Target/ObjCLanguageRuntime.cpp b/lldb/source/Target/ObjCLanguageRuntime.cpp
index 7e0838e..fac1fae 100644
--- a/lldb/source/Target/ObjCLanguageRuntime.cpp
+++ b/lldb/source/Target/ObjCLanguageRuntime.cpp
@@ -302,8 +302,8 @@
 CompilerType
 ObjCLanguageRuntime::EncodingToType::RealizeType(const char *name,
                                                  bool for_expression) {
-  if (m_scratch_ast_ctx_ap)
-    return RealizeType(*m_scratch_ast_ctx_ap, name, for_expression);
+  if (m_scratch_ast_ctx_up)
+    return RealizeType(*m_scratch_ast_ctx_up, name, for_expression);
   return CompilerType();
 }