[clang] [clang] NFCI: Use `FileEntryRef` for `FileID` creation (PR #67838)

[Ben Langmuir via cfe-commits]

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@@ -843,7 +843,7 @@ void ClangMoveTool::moveDeclsToNewFiles() {
 // Move all contents from OldFile to NewFile.
 void ClangMoveTool::moveAll(SourceManager &SM, StringRef OldFile,
                             StringRef NewFile) {
-  auto FE = SM.getFileManager().getFile(makeAbsolutePath(OldFile));
+  auto FE = SM.getFileManager().getOptionalFileRef(makeAbsolutePath(OldFile));
   if (!FE) {
     llvm::errs() << "Failed to get file: " << OldFile << "\n";
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benlangmuir wrote:

Recommend `getFileRef` and then print the error message as well if it fails.

https://github.com/llvm/llvm-project/pull/67838
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