[clang] Migrate away from PointerUnion::{is,get} (NFC) (#119724)

Note that PointerUnion::{is,get} have been soft deprecated in
PointerUnion.h:

  // FIXME: Replace the uses of is(), get() and dyn_cast() with
  //        isa<T>, cast<T> and the llvm::dyn_cast<T>

I'm not touching PointerUnion::dyn_cast for now because it's a bit
complicated; we could blindly migrate it to dyn_cast_if_present, but
we should probably use dyn_cast when the operand is known to be
non-null.

1 files changed, 4 insertions, 4 deletions

diff --git a/clang/lib/Basic/FileManager.cpp b/clang/lib/Basic/FileManager.cpp
index f44b5e4..f0b6f7b 100644
--- a/clang/lib/Basic/FileManager.cpp
+++ b/clang/lib/Basic/FileManager.cpp
@@ -324,9 +324,9 @@ llvm::Expected<FileEntryRef> FileManager::getFileRef(StringRef Filename,
         *SeenFileEntries
              .insert({Status.getName(), FileEntryRef::MapValue(*UFE, DirInfo)})
              .first;
-    assert(Redirection.second->V.is<FileEntry *>() &&
+    assert(isa<FileEntry *>(Redirection.second->V) &&
            "filename redirected to a non-canonical filename?");
-    assert(Redirection.second->V.get<FileEntry *>() == UFE &&
+    assert(cast<FileEntry *>(Redirection.second->V) == UFE &&
            "filename from getStatValue() refers to wrong file");
 
     // Cache the redirection in the previously-inserted entry, still available
@@ -400,7 +400,7 @@ FileEntryRef FileManager::getVirtualFileRef(StringRef Filename, off_t Size,
     FileEntryRef::MapValue Value = *NamedFileEnt.second;
     if (LLVM_LIKELY(isa<FileEntry *>(Value.V)))
       return FileEntryRef(NamedFileEnt);
-    return FileEntryRef(*Value.V.get<const FileEntryRef::MapEntry *>());
+    return FileEntryRef(*cast<const FileEntryRef::MapEntry *>(Value.V));
   }
 
   // We've not seen this before, or the file is cached as non-existent.
@@ -620,7 +620,7 @@ void FileManager::GetUniqueIDMapping(
 
   for (const auto &Entry : SeenFileEntries) {
     // Only return files that exist and are not redirected.
-    if (!Entry.getValue() || !Entry.getValue()->V.is<FileEntry *>())
+    if (!Entry.getValue() || !isa<FileEntry *>(Entry.getValue()->V))
       continue;
     FileEntryRef FE(Entry);
     // Add this file if it's the first one with the UID, or if its name is