[Fuchsia] Use -z dead-reloc-in-nonalloc=*=0 for Fuchsia targets

clang/lib/Driver/ToolChains/Fuchsia.cpp

void fuchsia::Linker::ConstructJob(Compilation &C, const JobAction &JA,
   Args.ClaimAllArgs(options::OPT_w);
 
   CmdArgs.push_back("-z");
   CmdArgs.push_back("max-page-size=4096");
 
   CmdArgs.push_back("-z");
   CmdArgs.push_back("now");
 
+  // 0 is never a valid code address for Fuchsia (user or kernel), so using the
+  // traditional 0 value for references to discarded code is always fine on
+  // Fuchsia.  The new defaults of -1 and such in lld confuse some older tools
+  // for no benefit to Fuchsia.
+  CmdArgs.push_back("-z");
+  CmdArgs.push_back("dead-reloc-in-nonalloc=*=0");
+
   const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
   if (llvm::sys::path::filename(Exec).equals_lower("ld.lld") ||
       llvm::sys::path::stem(Exec).equals_lower("ld.lld")) {
     CmdArgs.push_back("-z");
     CmdArgs.push_back("rodynamic");
     CmdArgs.push_back("-z");
     CmdArgs.push_back("separate-loadable-segments");
     CmdArgs.push_back("--pack-dyn-relocs=relr");