fix(gnovm): handle calling method with value receiver on nil (#3861)

This used to return a weird panic, now it correctly panics with a nil
pointer dereference.

Extracted from #3847.

---------

Co-authored-by: ltzmaxwell <[email protected]>

Author: thehowl

gnovm/pkg/gnolang/values.go

@@ -1717,6 +1717,9 @@ func (tv *TypedValue) GetPointerToFromTV(alloc *Allocator, store Store, path Val
 			panic("should not happen")
 		}
 	case VPDerefValMethod:
+		if tv.V == nil {
+			panic(&Exception{Value: typedString("nil pointer dereference")})
+		}
 		dtv2 := tv.V.(PointerValue).TV
 		dtv = &TypedValue{ // In case method is called on converted type, like ((*othertype)x).Method().
 			T: tv.T.Elem(),

gnovm/tests/files/ptr11.gno

@@ -0,0 +1,13 @@
+package main
+
+type S struct{}
+
+func (s S) String() string { return "hey" }
+
+func main() {
+	v := (*S)(nil)
+	v.String()
+}
+
+// Error:
+// nil pointer dereference

gnovm/tests/files/ptr11a.gno

@@ -0,0 +1,23 @@
+package main
+
+type S struct{}
+
+func (s S) String() string { return "hey" }
+
+type Stringer interface {
+	String() string
+}
+
+func main() {
+	defer func() {
+		rec := recover()
+		if rec != nil {
+			println("recovered", rec)
+		}
+	}()
+	v := (*S)(nil)
+	println(Stringer(v).String())
+}
+
+// Output:
+// recovered nil pointer dereference

gnovm/tests/files/ptr11b.gno

@@ -0,0 +1,17 @@
+package main
+
+type S struct{}
+
+func (s S) String() string { return "hey" }
+
+type Stringer interface {
+	String() string
+}
+
+func main() {
+	v := (*S)(nil)
+	println(Stringer(v).String())
+}
+
+// Error:
+// nil pointer dereference