[lld] [ELF] Add --thinlto-index= (PR #109534)

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github-actions[bot] wrote:

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``````````bash
git-clang-format --diff 18225c783a00bde62f19a177a57de388e20c2bba 0f57d5e19a1a9fe617a3513163a7777f0bf5dea5 --extensions h,cpp -- lld/ELF/Config.h lld/ELF/Driver.cpp lld/ELF/LTO.cpp
``````````

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<details>
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View the diff from clang-format here.
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``````````diff
diff --git a/lld/ELF/LTO.cpp b/lld/ELF/LTO.cpp
index 2398b36dad..0de4e6de1e 100644
--- a/lld/ELF/LTO.cpp
+++ b/lld/ELF/LTO.cpp
@@ -205,8 +205,8 @@ BitcodeCompiler::BitcodeCompiler() {
     if (auto os = openFile(ctx.arg.thinLTOIndex)) {
       for (BitcodeFile *file : ctx.bitcodeFiles) {
         StringRef nativeDir = ctx.arg.thinLTOPrefixReplaceNativeObject.empty()
-                               ? ctx.arg.thinLTOPrefixReplaceNew
-                               : ctx.arg.thinLTOPrefixReplaceNativeObject;
+                                  ? ctx.arg.thinLTOPrefixReplaceNew
+                                  : ctx.arg.thinLTOPrefixReplaceNativeObject;
         *os << file->getName() << '='
             << lto::getThinLTOOutputFile(replaceThinLTOSuffix(file->getName()),
                                          ctx.arg.thinLTOPrefixReplaceOld,

``````````

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https://github.com/llvm/llvm-project/pull/109534