[clang][lex] NFCI: Use FileEntryRef in ModuleMap::{load,lookup}ModuleMap()
This patch changes the return/argument types of `ModuleMap::{load,lookup}ModuleMap()` from `const FileEntry *` to `FileEntryRef` in order to remove uses of the deprecated `DirectoryEntry::getName()`. Reviewed By: bnbarham Differential Revision: https://reviews.llvm.org/D127647
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