[llvm] [clang] [clang] NFC: Deprecate `FileEntry::getName()` (PR #68157)

[Jan Svoboda via cfe-commits]

================
@@ -157,6 +157,25 @@
 #define LLVM_DEPRECATED(MSG, FIX) [[deprecated(MSG)]]
 #endif
 
+// clang-format off
+#if defined(__clang__) || defined(__GNUC__)
+#define LLVM_IGNORE_DEPRECATIONS_OF_DECLARATIONS_BEGIN                         \
----------------
jansvoboda11 wrote:

OK, I used the suggested naming, but added `DECLARATIONS` to distinguish from semantics of the libc++ version that also ignores `-Wdeprecated`, which I don't want to (and I'm not sure there's an MSVC counterpart). I left this in `Compiler.h`, since this might be useful in other parts of LLVM and for downstream projects that have extra usages of `FileEntry::getName()`.

https://github.com/llvm/llvm-project/pull/68157