Add a type for objects with typed properties.

test/cctest/types-fuzz.h

Index: test/cctest/types-fuzz.h
diff --git a/test/cctest/types-fuzz.h b/test/cctest/types-fuzz.h
index 60f054a66e99bbe067a21a6b8882829d0b87d628..6313c6d272af8ccbf82fbc3e62b4276d4f003dc0 100644
--- a/test/cctest/types-fuzz.h
+++ b/test/cctest/types-fuzz.h
@@ -215,6 +215,8 @@ class Types {
     return Type::Function(result, arg1, arg2, region_);
   }
 
+  TypeHandle ExplicitObject(int size) { return Type::Object(size, region_); }
+
   TypeHandle Union(TypeHandle t1, TypeHandle t2) {
     return Type::Union(t1, t2, region_);
   }
@@ -240,6 +242,8 @@ class Types {
     return types[rng_->NextInt(static_cast<int>(types.size()))];
   }
 
+  TypeHandle ExplicitAny() { return Type::Any(region_); }
+
   TypeHandle Fuzz(int depth = 4) {
     switch (rng_->NextInt(depth == 0 ? 3 : 20)) {
       case 0: {  // bitset