[lld] [lld][COFF]Expose UnifiedLTO options (PR #69904)

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

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``````````bash
git-clang-format --diff 3651f377f632d9152f2bd8fc2f9302ec9f9bdd5e b908916f765a9106324f37a99097c1329ecafafe -- lld/COFF/Config.h lld/COFF/Driver.cpp lld/COFF/LTO.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/lld/COFF/Config.h b/lld/COFF/Config.h
index 186fb1774..cbf3595b3 100644
--- a/lld/COFF/Config.h
+++ b/lld/COFF/Config.h
@@ -14,10 +14,10 @@
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringRef.h"
+#include "llvm/LTO/LTO.h"
 #include "llvm/Object/COFF.h"
 #include "llvm/Support/CachePruning.h"
 #include "llvm/Support/VirtualFileSystem.h"
-#include "llvm/LTO/LTO.h"
 #include <cstdint>
 #include <map>
 #include <set>
@@ -25,9 +25,9 @@
 
 namespace lld::coff {
 
+using llvm::StringRef;
 using llvm::COFF::IMAGE_FILE_MACHINE_UNKNOWN;
 using llvm::COFF::WindowsSubsystem;
-using llvm::StringRef;
 using llvm::lto::LTO;
 class DefinedAbsolute;
 class StringChunk;
diff --git a/lld/COFF/LTO.cpp b/lld/COFF/LTO.cpp
index c559449ae..95c16a02e 100644
--- a/lld/COFF/LTO.cpp
+++ b/lld/COFF/LTO.cpp
@@ -126,8 +126,8 @@ BitcodeCompiler::BitcodeCompiler(COFFLinkerContext &c) : ctx(c) {
         llvm::heavyweight_hardware_concurrency(ctx.config.thinLTOJobs));
   }
 
-  ltoObj = std::make_unique<lto::LTO>(createConfig(), backend,
-                                      ctx.config.ltoPartitions,ctx.config.ltoKind);
+  ltoObj = std::make_unique<lto::LTO>(
+      createConfig(), backend, ctx.config.ltoPartitions, ctx.config.ltoKind);
 }
 
 BitcodeCompiler::~BitcodeCompiler() = default;

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https://github.com/llvm/llvm-project/pull/69904