[LLDB] Fix logically dead code

Summary:
The indicated dead code may have performed some action; that action will never occur.

In lldb_private::LoadedModuleInfoList::LoadedModuleInfo::operator ==(lldb_private::LoadedModuleInfoList::LoadedModuleInfo const &): Code can never be reached because of a logical contradiction (CWE-561)

Coverity Scan: https://scan.coverity.com/projects/kwk-llvm-project?tab=overview

CID 221581

Subscribers: lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D67915

llvm-svn: 372608