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

This will make it easy for callers to see issues with and fix up calls
to createTargetMachine after a future change to the params of
TargetMachine.

This matches other nearby enums.

For downstream users, this should be a fairly straightforward
replacement,
e.g. s/CodeGenOpt::Aggressive/CodeGenOptLevel::Aggressive
or s/CGFT_/CodeGenFileType::

1 files changed, 2 insertions, 2 deletions

diff --git a/flang/lib/Frontend/CompilerInvocation.cpp b/flang/lib/Frontend/CompilerInvocation.cpp
index dba2ac1..6c0b90c 100644
--- a/flang/lib/Frontend/CompilerInvocation.cpp
+++ b/flang/lib/Frontend/CompilerInvocation.cpp
@@ -98,12 +98,12 @@ static bool parseShowColorsArgs(const llvm::opt::ArgList &args,
 /// Extracts the optimisation level from \a args.
 static unsigned getOptimizationLevel(llvm::opt::ArgList &args,
                                      clang::DiagnosticsEngine &diags) {
-  unsigned defaultOpt = llvm::CodeGenOpt::None;
+  unsigned defaultOpt = 0;
 
   if (llvm::opt::Arg *a =
           args.getLastArg(clang::driver::options::OPT_O_Group)) {
     if (a->getOption().matches(clang::driver::options::OPT_O0))
-      return llvm::CodeGenOpt::None;
+      return 0;
 
     assert(a->getOption().matches(clang::driver::options::OPT_O));