Add a note to the test explaining why it doesn't match gold's behaviour.

llvm-svn: 267371

lld/test/ELF/undef-version-script.s

@@ -3,6 +3,9 @@
 # RUN: ld.lld --version-script %t.script -shared %t.o -o %t.so
 # RUN: llvm-readobj -dyn-symbols %t.so | FileCheck %s
 
+# This does not match gold's behavior because gold does not create undefined
+# symbols in dynsym without an appropriate (e.g. PLT) relocation in the input.
+
 # CHECK:      DynamicSymbols [
 # CHECK-NEXT:   Symbol {
 # CHECK-NEXT:     Name: @ (0)