[lld] ELF: Introduce --shuffle-padding flag. (PR #117653)

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


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``````````bash
git-clang-format --diff 30af6fb163add17a6be515200881afdff91d213a 75ad826539205c52e1d9502938bb814ce914853b --extensions cpp,h -- lld/ELF/Config.h lld/ELF/Driver.cpp lld/ELF/OutputSections.h lld/ELF/SyntheticSections.cpp lld/ELF/SyntheticSections.h lld/ELF/Writer.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/lld/ELF/Writer.cpp b/lld/ELF/Writer.cpp
index 3c1ab32348..7591b5c0ff 100644
--- a/lld/ELF/Writer.cpp
+++ b/lld/ELF/Writer.cpp
@@ -1445,9 +1445,9 @@ static void finalizeSynthetic(Ctx &ctx, SyntheticSection *sec) {
 }
 
 static bool canInsertPadding(OutputSection *sec) {
-    StringRef s = sec->name;
-    return s == ".bss" || s == ".data" || s == ".data.rel.ro" ||
-           s == ".rodata" || s.starts_with(".text");
+  StringRef s = sec->name;
+  return s == ".bss" || s == ".data" || s == ".data.rel.ro" || s == ".rodata" ||
+         s.starts_with(".text");
 }
 
 static void shufflePadding(Ctx &ctx) {
@@ -1465,8 +1465,9 @@ static void shufflePadding(Ctx &ctx) {
           curPtLoad = os->ptLoad;
         }
         for (InputSection *isec : isd->sections) {
-          if (g() < (1<<28))
-            tmp.push_back(make<ShufflePaddingSection>(ctx, isec->addralign, os));
+          if (g() < (1 << 28))
+            tmp.push_back(
+                make<ShufflePaddingSection>(ctx, isec->addralign, os));
           tmp.push_back(isec);
         }
         isd->sections = std::move(tmp);

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https://github.com/llvm/llvm-project/pull/117653