[clang] [NFC][CodeGen] Change CodeGenOpt::Level/CodeGenFileType into enum classes (PR #66295)

[Arthur Eubanks via cfe-commits]

================
@@ -661,27 +661,27 @@ static bool FixupInvocation(CompilerInvocation 
&Invocation,
 
 static unsigned getOptimizationLevel(ArgList &Args, InputKind IK,
                                      DiagnosticsEngine &Diags) {
-  unsigned DefaultOpt = llvm::CodeGenOpt::None;
+  unsigned DefaultOpt = 0;
   if ((IK.getLanguage() == Language::OpenCL ||
        IK.getLanguage() == Language::OpenCLCXX) &&
       !Args.hasArg(OPT_cl_opt_disable))
-    DefaultOpt = llvm::CodeGenOpt::Default;
+    DefaultOpt = 2;
----------------
aeubanks wrote:

`llvm::CodeGenOpt` is for LLVM's codegen pipeline, but here it's getting 
overloaded to be used in clang's IR codegen. These are two different concepts 
where the defaults happen to have the same value.

https://github.com/llvm/llvm-project/pull/66295
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