[clang] [flang] [mlir] [flang] Add basic -mtune support (PR #95043)

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:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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git-clang-format --diff d3c0ed387c478dc07daac575b2ec1216b8044b56 2312d31b14aecc6eeea2e81d221ee004e5de3efc -- clang/lib/Driver/ToolChains/Flang.cpp flang/include/flang/Frontend/TargetOptions.h flang/include/flang/Lower/Bridge.h flang/include/flang/Optimizer/CodeGen/Target.h flang/include/flang/Optimizer/Dialect/Support/FIRContext.h flang/lib/Frontend/CompilerInvocation.cpp flang/lib/Frontend/FrontendActions.cpp flang/lib/Lower/Bridge.cpp flang/lib/Optimizer/CodeGen/CodeGen.cpp flang/lib/Optimizer/CodeGen/Target.cpp flang/lib/Optimizer/CodeGen/TargetRewrite.cpp flang/lib/Optimizer/CodeGen/TypeConverter.cpp flang/lib/Optimizer/Dialect/Support/FIRContext.cpp flang/tools/bbc/bbc.cpp flang/tools/tco/tco.cpp flang/unittests/Optimizer/FIRContextTest.cpp mlir/lib/Target/LLVMIR/ModuleImport.cpp mlir/lib/Target/LLVMIR/ModuleTranslation.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Driver/ToolChains/Flang.cpp b/clang/lib/Driver/ToolChains/Flang.cpp
index 3dc7ee0ea2..fa5ad1e50b 100644
--- a/clang/lib/Driver/ToolChains/Flang.cpp
+++ b/clang/lib/Driver/ToolChains/Flang.cpp
@@ -15,9 +15,9 @@
 #include "llvm/Frontend/Debug/Options.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Path.h"
+#include "llvm/TargetParser/Host.h"
 #include "llvm/TargetParser/RISCVISAInfo.h"
 #include "llvm/TargetParser/RISCVTargetParser.h"
-#include "llvm/TargetParser/Host.h"
 
 #include <cassert>
 

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https://github.com/llvm/llvm-project/pull/95043