[lld] [lld][ELF] filter out section-type symbols when use BP reorder (PR #151685)

[Fangrui Song via llvm-commits]

================
@@ -76,10 +76,12 @@ DenseMap<const InputSectionBase *, int> elf::runBalancedPartitioning(
     if (!d)
       return;
     auto *sec = dyn_cast_or_null<InputSection>(d->section);
+
     // Skip empty, discarded, ICF folded sections, .bss. Skipping ICF folded
     // sections reduces duplicate detection work in BPSectionOrderer.
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MaskRay wrote:

Add comment: `Skip section symbols.`

https://github.com/llvm/llvm-project/pull/151685