ssa: fix llgo:type c for typeparam named

cl/_testrt/tpfunc/in.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"unsafe"
+)
+
+type Func func(*int)
+
+//llgo:type C
+type CFunc func(*int)
+
+//llgo:type C
+type Callback[T any] func(*T)
+
+func main() {
+	var fn1 Func = func(v *int) {
+		println(*v)
+	}
+	var fn2 CFunc = func(v *int) {
+		println(*v)
+	}
+	var fn3 Callback[int] = func(v *int) {
+		println(*v)
+	}
+	println(unsafe.Sizeof(fn1), unsafe.Sizeof(fn2), unsafe.Sizeof(fn3))
+}