[lld] [LLD][COFF] Add support for custom section layout (PR #152779)

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


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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions h,cpp -- lld/COFF/Config.h lld/COFF/Driver.cpp lld/COFF/Driver.h lld/COFF/DriverUtils.cpp lld/COFF/Writer.cpp
``````````

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<details>
<summary>
View the diff from clang-format here.
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``````````diff
diff --git a/lld/COFF/Writer.cpp b/lld/COFF/Writer.cpp
index ed71844ae..f777dcb4a 100644
--- a/lld/COFF/Writer.cpp
+++ b/lld/COFF/Writer.cpp
@@ -1424,23 +1424,23 @@ void Writer::layoutSections() {
   for (size_t i = 0; i < ctx.outputSections.size(); ++i)
     originalOrder[ctx.outputSections[i]] = i;
 
-  std::stable_sort(ctx.outputSections.begin(), ctx.outputSections.end(),
-                   [this, &originalOrder](const OutputSection *a,
-                                          const OutputSection *b) {
-                     auto itA = ctx.config.sectionLayout.find(a->name.str());
-                     auto itB = ctx.config.sectionLayout.find(b->name.str());
-
-                     if (itA != ctx.config.sectionLayout.end() &&
-                         itB != ctx.config.sectionLayout.end())
-                       return itA->second < itB->second;
-
-                     if (itA == ctx.config.sectionLayout.end() &&
-                         itB == ctx.config.sectionLayout.end())
-                       return originalOrder[a] < originalOrder[b];
-
-                     // Not found in layout file; respect the original order
-                     return originalOrder[a] < originalOrder[b];
-                   });
+  std::stable_sort(
+      ctx.outputSections.begin(), ctx.outputSections.end(),
+      [this, &originalOrder](const OutputSection *a, const OutputSection *b) {
+        auto itA = ctx.config.sectionLayout.find(a->name.str());
+        auto itB = ctx.config.sectionLayout.find(b->name.str());
+
+        if (itA != ctx.config.sectionLayout.end() &&
+            itB != ctx.config.sectionLayout.end())
+          return itA->second < itB->second;
+
+        if (itA == ctx.config.sectionLayout.end() &&
+            itB == ctx.config.sectionLayout.end())
+          return originalOrder[a] < originalOrder[b];
+
+        // Not found in layout file; respect the original order
+        return originalOrder[a] < originalOrder[b];
+      });
 }
 
 // The Windows loader doesn't seem to like empty sections,

``````````

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https://github.com/llvm/llvm-project/pull/152779