[llvm] [BPF] Remove unused weak symbol __bpf_trap (PR #166003)

[via llvm-commits]

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@@ -88,6 +88,16 @@ bool BPFAsmPrinter::doFinalization(Module &M) {
     }
   }
 
+  for (GlobalObject &GO : M.global_objects()) {
+    if (!GO.hasExternalWeakLinkage())
+      continue;
+
+    if (!SawTrapCall && GO.getName() == BPF_TRAP) {
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eddyz87 wrote:

Why is the trap call special? Can we remove all external weak linkage symbols that are not used?

https://github.com/llvm/llvm-project/pull/166003