[clang] [lld] [llvm] [Windows] Add support for emitting PGO/LTO magic strings in the Windows PE debug directory (PR #114260)

[Mikołaj Piróg via cfe-commits]

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@@ -1165,6 +1188,23 @@ void Writer::createMiscChunks() {
   llvm::TimeTraceScope timeScope("Misc chunks");
   Configuration *config = &ctx.config;
 
+  auto searchForPgoMagicSection = [this](char sectionName[]) {
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mikolaj-pirog wrote:

I measured this by linking clang with lld with this change vs without this change, see my comment in the discussion

https://github.com/llvm/llvm-project/pull/114260