Replace compiler hack for sync package with //go:linkname

compiler.go

@@ -1325,11 +1325,6 @@ func (c *Compiler) parseBuiltin(frame *Frame, args []ssa.Value, callName string)
 }
 
 func (c *Compiler) parseFunctionCall(frame *Frame, args []ssa.Value, llvmFn llvm.Value, blocking bool, parentHandle llvm.Value) (llvm.Value, error) {
-	if llvmFn.Name() == "sync.runtime_registerPoolCleanup" || llvmFn.Name() == "sync.runtime_notifyListCheck" {
-		// Ignore these functions calls for now, as a hack.
-		// TODO: implement //go:linkname.
-		return llvm.Value{}, nil
-	}
 	var params []llvm.Value
 	if blocking {
 		if parentHandle.IsNil() {

src/runtime/sync.go

@@ -0,0 +1,13 @@
+package runtime
+
+// This file contains support code for the sync package.
+
+//go:linkname registerPoolCleanup sync.runtime_registerPoolCleanup
+func registerPoolCleanup(cleanup func()) {
+	// Ignore.
+}
+
+//go:linkname notifyListCheck sync.runtime_notifyListCheck
+func notifyListCheck(size uintptr) {
+	// Ignore.
+}