Update to go1.24.0

test/codegen/writebarrier.go

@@ -54,6 +54,16 @@ func combine4slice(p *[4][]byte, a, b, c, d []byte) {
 	p[3] = d
 }
 
+func trickyWriteNil(p *int, q **int) {
+	if p == nil {
+		// We change "= p" to "= 0" in the prove pass, which
+		// means we have one less pointer that needs to go
+		// into the write barrier buffer.
+		// amd64:`.*runtime[.]gcWriteBarrier1`
+		*q = p
+	}
+}
+
 type S struct {
 	a, b string
 	c    *int