[lld] [lld][elf] Skip BP ordering input sections with null data (PR #149265)

[Pengying Xu via llvm-commits]

================
@@ -76,10 +76,10 @@ DenseMap<const InputSectionBase *, int> elf::runBalancedPartitioning(
     if (!d)
       return;
     auto *sec = dyn_cast_or_null<InputSection>(d->section);
-    // Skip empty, discarded, ICF folded sections. Skipping ICF folded sections
-    // reduces duplicate detection work in BPSectionOrderer.
+    // Skip empty, discarded, ICF folded sections, .bss. Skipping ICF folded
+    // sections reduces duplicate detection work in BPSectionOrderer.
     if (!sec || sec->size == 0 || !sec->isLive() || sec->repl != sec ||
-        !orderer.secToSym.try_emplace(sec, d).second)
+        !orderer.secToSym.try_emplace(sec, d).second || !sec->content().data())
----------------
Colibrow wrote:

Yeah. Fixed it.

https://github.com/llvm/llvm-project/pull/149265