runtime: add linkname back on

src/runtime/symtab.go

@@ -480,7 +480,18 @@ var pinnedTypemaps []map[typeOff]*_type
 // the relocated one.
 var aixStaticDataBase uintptr // linker symbol
 
-var firstmoduledata moduledata  // linker symbol
+var firstmoduledata moduledata // linker symbol
+
+// lastmoduledatap should be an internal detail,
+// but widely used packages access it using linkname.
+// Notable members of the hall of shame include:
+//   - github.com/bytedance/sonic
+//
+// Do not remove or change the type signature.
+// See go.dev/issues/67401.
+// See go.dev/issues/71672.
+//
+//go:linkname lastmoduledatap runtime.lastmoduledatap
 var lastmoduledatap *moduledata // linker symbol
 
 var modulesSlice *[]*moduledata // see activeModules