compiler: fix difference in aliases in interface methods

There used to be a difference between `byte` and `uint8` in interface
methods. These are aliases, so they should be treated the same.
This patch introduces a custom serialization format for types,
circumventing the `Type.String()` method that is slightly wrong for our
purposes.

This also fixes an issue with the `any` keyword in Go 1.18, which
suffers from the same problem (but this time actually leads to a crash).

transform/reflect.go

@@ -40,24 +40,24 @@ import (
 // A list of basic types and their numbers. This list should be kept in sync
 // with the list of Kind constants of type.go in the reflect package.
 var basicTypes = map[string]int64{
-	"bool":       1,
-	"int":        2,
-	"int8":       3,
-	"int16":      4,
-	"int32":      5,
-	"int64":      6,
-	"uint":       7,
-	"uint8":      8,
-	"uint16":     9,
-	"uint32":     10,
-	"uint64":     11,
-	"uintptr":    12,
-	"float32":    13,
-	"float64":    14,
-	"complex64":  15,
-	"complex128": 16,
-	"string":     17,
-	"unsafeptr":  18,
+	"bool":           1,
+	"int":            2,
+	"int8":           3,
+	"int16":          4,
+	"int32":          5,
+	"int64":          6,
+	"uint":           7,
+	"uint8":          8,
+	"uint16":         9,
+	"uint32":         10,
+	"uint64":         11,
+	"uintptr":        12,
+	"float32":        13,
+	"float64":        14,
+	"complex64":      15,
+	"complex128":     16,
+	"string":         17,
+	"unsafe.Pointer": 18,
 }
 
 // A list of non-basic types. Adding 19 to this number will give the Kind as