[lld-link] Enable addrsig table in COFF lto

This allow safe-icf mode to work when linking with LTO.

Differential Revision: https://reviews.llvm.org/D99613

lld/COFF/LTO.cpp

@@ -62,6 +62,7 @@ static std::string getThinLTOOutputFile(StringRef path) {
 static lto::Config createConfig() {
   lto::Config c;
   c.Options = initTargetOptionsFromCodeGenFlags();
+  c.Options.EmitAddrsig = true;
 
   // Always emit a section per function/datum with LTO. LLVM LTO should get most
   // of the benefit of linker GC, but there are still opportunities for ICF.