[clang] [flang] Add flags controlling whether to run the fir alias tags pass (PR #68595)

[Andrzej Warzyński via cfe-commits]

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@@ -214,6 +214,14 @@ static void parseCodeGenArgs(Fortran::frontend::CodeGenOptions &opts,
                    clang::driver::options::OPT_fno_loop_versioning, false))
     opts.LoopVersioning = 1;
 
+  opts.AliasAnalysis = false;
+  if (auto *arg =
+          args.getLastArg(clang::driver::options::OPT_falias_analysis,
+                          clang::driver::options::OPT_fno_alias_analysis)) {
+    if (arg->getOption().matches(clang::driver::options::OPT_falias_analysis))
+      opts.AliasAnalysis = true;
+  }
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banach-space wrote:

Wouldn't `hasFlag` work here?

https://github.com/llvm/llvm-project/pull/68595