Reland "[lldb] Remove non address bits when looking up memory regions"

This reverts commit 5fbcf67734.

ProcessDebugger is used in ProcessWindows and NativeProcessWindows.
I thought I was simplifying things by renaming to DoGetMemoryRegionInfo
in ProcessDebugger but the Native process side expects "GetMemoryRegionInfo".

Follow the pattern that WriteMemory uses. So:
* ProcessWindows::DoGetMemoryRegioninfo calls ProcessDebugger::GetMemoryRegionInfo
* NativeProcessWindows::GetMemoryRegionInfo does the same

lldb/source/Plugins/Process/scripted/ScriptedProcess.cpp

@@ -249,8 +249,8 @@ ArchSpec ScriptedProcess::GetArchitecture() {
   return GetTarget().GetArchitecture();
 }
 
-Status ScriptedProcess::GetMemoryRegionInfo(lldb::addr_t load_addr,
-                                            MemoryRegionInfo &region) {
+Status ScriptedProcess::DoGetMemoryRegionInfo(lldb::addr_t load_addr,
+                                              MemoryRegionInfo &region) {
   CheckInterpreterAndScriptObject();
 
   Status error;