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/Plugins/Process/Linux/NativeProcessLinux.cpp b/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp
index f5204a6..bab2a71 100644
--- a/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp
+++ b/lldb/source/Plugins/Process/Linux/NativeProcessLinux.cpp
@@ -948,25 +948,25 @@
   Status error;
   NativeRegisterContext& register_context = thread.GetRegisterContext();
 
-  std::unique_ptr<EmulateInstruction> emulator_ap(
+  std::unique_ptr<EmulateInstruction> emulator_up(
       EmulateInstruction::FindPlugin(m_arch, eInstructionTypePCModifying,
                                      nullptr));
 
-  if (emulator_ap == nullptr)
+  if (emulator_up == nullptr)
     return Status("Instruction emulator not found!");
 
   EmulatorBaton baton(*this, register_context);
-  emulator_ap->SetBaton(&baton);
-  emulator_ap->SetReadMemCallback(&ReadMemoryCallback);
-  emulator_ap->SetReadRegCallback(&ReadRegisterCallback);
-  emulator_ap->SetWriteMemCallback(&WriteMemoryCallback);
-  emulator_ap->SetWriteRegCallback(&WriteRegisterCallback);
+  emulator_up->SetBaton(&baton);
+  emulator_up->SetReadMemCallback(&ReadMemoryCallback);
+  emulator_up->SetReadRegCallback(&ReadRegisterCallback);
+  emulator_up->SetWriteMemCallback(&WriteMemoryCallback);
+  emulator_up->SetWriteRegCallback(&WriteRegisterCallback);
 
-  if (!emulator_ap->ReadInstruction())
+  if (!emulator_up->ReadInstruction())
     return Status("Read instruction failed!");
 
   bool emulation_result =
-      emulator_ap->EvaluateInstruction(eEmulateInstructionOptionAutoAdvancePC);
+      emulator_up->EvaluateInstruction(eEmulateInstructionOptionAutoAdvancePC);
 
   const RegisterInfo *reg_info_pc = register_context.GetRegisterInfo(
       eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC);
@@ -994,7 +994,7 @@
     // the size of the current opcode because the emulation of all
     // PC modifying instruction should be successful. The failure most
     // likely caused by a not supported instruction which don't modify PC.
-    next_pc = register_context.GetPC() + emulator_ap->GetOpcode().GetByteSize();
+    next_pc = register_context.GetPC() + emulator_up->GetOpcode().GetByteSize();
     next_flags = ReadFlags(register_context);
   } else {
     // The instruction emulation failed after it modified the PC. It is an