[flang] remove -f[no-]alias-analysis (#74343)

Now that tbaa tags pass is enabled by default, I would like to remove
these flags. `-fno-alias-analysis` was originally intended to be useful
for debugging, but as it also disables tbaa tag generation in codegen,
it turned out to be too noisy.

@banach-space expressed that these flags felt too non-standard.

The tbaa tags pass can be toggled using `-mllvm
-disable-fir-alias-tags=0`

1 files changed, 0 insertions, 5 deletions

diff --git a/flang/lib/Frontend/CompilerInvocation.cpp b/flang/lib/Frontend/CompilerInvocation.cpp
index 62b6c38..c623969 100644
--- a/flang/lib/Frontend/CompilerInvocation.cpp
+++ b/flang/lib/Frontend/CompilerInvocation.cpp
@@ -243,11 +243,6 @@ static void parseCodeGenArgs(Fortran::frontend::CodeGenOptions &opts,
     opts.LoopVersioning = 1;
 
   opts.AliasAnalysis = opts.OptimizationLevel > 0;
-  if (auto *arg =
-          args.getLastArg(clang::driver::options::OPT_falias_analysis,
-                          clang::driver::options::OPT_fno_alias_analysis))
-    opts.AliasAnalysis =
-        arg->getOption().matches(clang::driver::options::OPT_falias_analysis);
 
   for (auto *a : args.filtered(clang::driver::options::OPT_fpass_plugin_EQ))
     opts.LLVMPassPlugins.push_back(a->getValue());