[clang] [llvm] [flang] [Flang][WIP/RFC] Enable TSan for Flang (PR #74643)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff 1e1e11a4d7c57028953a23deae622acab5eee9ff 03c22524ecf8851951d37f6282b3cd43edb8607e -- clang/lib/Driver/ToolChains/Flang.cpp flang/include/flang/Common/Fortran-features.h flang/lib/Frontend/CompilerInvocation.cpp flang/lib/Frontend/FrontendActions.cpp llvm/lib/Transforms/Instrumentation/ThreadSanitizer.cpp
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/flang/lib/Frontend/CompilerInvocation.cpp b/flang/lib/Frontend/CompilerInvocation.cpp
index 6b3c0706c9..ffcd3aefd6 100644
--- a/flang/lib/Frontend/CompilerInvocation.cpp
+++ b/flang/lib/Frontend/CompilerInvocation.cpp
@@ -862,7 +862,9 @@ static bool parseDialectArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
     res.getFrontendOpts().features.Enable(
         Fortran::common::LanguageFeature::OpenACC);
   }
-  if (args.hasArg(clang::driver::options::OPT_fsanitize_EQ) && llvm::StringRef(args.getLastArg(clang::driver::options::OPT_fsanitize_EQ)->getValue()) == "thread" ) {
+  if (args.hasArg(clang::driver::options::OPT_fsanitize_EQ) &&
+      llvm::StringRef(args.getLastArg(clang::driver::options::OPT_fsanitize_EQ)
+                          ->getValue()) == "thread") {
     res.getFrontendOpts().features.Enable(
         Fortran::common::LanguageFeature::TSan);
   }
diff --git a/flang/lib/Frontend/FrontendActions.cpp b/flang/lib/Frontend/FrontendActions.cpp
index 423e121cdf..7abd283114 100644
--- a/flang/lib/Frontend/FrontendActions.cpp
+++ b/flang/lib/Frontend/FrontendActions.cpp
@@ -66,9 +66,9 @@
 #include "llvm/Support/ToolOutputFile.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/TargetParser/TargetParser.h"
-#include "llvm/Transforms/Utils/ModuleUtils.h"
 #include "llvm/Transforms/Instrumentation.h"
 #include "llvm/Transforms/Instrumentation/ThreadSanitizer.h"
+#include "llvm/Transforms/Utils/ModuleUtils.h"
 
 #include <memory>
 #include <system_error>
@@ -1079,7 +1079,8 @@ void CodeGenAction::runOptimizationPipeline(llvm::raw_pwrite_stream &os) {
   if (this->getInstance().getInvocation().getFrontendOpts().features.IsEnabled(
           Fortran::common::LanguageFeature::TSan)) {
     mpm.addPass(llvm::ModuleThreadSanitizerPass());
-    mpm.addPass(llvm::createModuleToFunctionPassAdaptor(llvm::ThreadSanitizerPass()));
+    mpm.addPass(
+        llvm::createModuleToFunctionPassAdaptor(llvm::ThreadSanitizerPass()));
   }
   if (action == BackendActionTy::Backend_EmitBC)
     mpm.addPass(llvm::BitcodeWriterPass(os));

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https://github.com/llvm/llvm-project/pull/74643