Fix outdated markWord test semantics.

Author: Arraying

test/hotspot/gtest/oops/test_markWord.cpp

@@ -157,7 +157,6 @@ TEST_VM(markWord, prototype) {
 
   EXPECT_TRUE(mark.has_no_hash());
   EXPECT_FALSE(mark.is_marked());
-  EXPECT_TRUE(mark.decode_pointer() == nullptr);
 
   assert_copy_set_hash(mark);
   assert_type(mark);
@@ -180,7 +179,6 @@ TEST_VM(markWord, inline_type_prototype) {
 
   EXPECT_TRUE(mark.has_no_hash());
   EXPECT_FALSE(mark.is_marked());
-  EXPECT_TRUE(mark.decode_pointer() == nullptr);
 
   markWord larval = mark.enter_larval_state();
   EXPECT_TRUE(larval.is_larval_state());
@@ -193,7 +191,6 @@ TEST_VM(markWord, inline_type_prototype) {
 
   EXPECT_TRUE(mark.has_no_hash());
   EXPECT_FALSE(mark.is_marked());
-  EXPECT_TRUE(mark.decode_pointer() == nullptr);
 }
 
 #if _LP64
@@ -214,7 +211,6 @@ TEST_VM(markWord, null_free_flat_array_prototype) {
 
   EXPECT_TRUE(mark.has_no_hash());
   EXPECT_FALSE(mark.is_marked());
-  EXPECT_TRUE(mark.decode_pointer() == nullptr);
 
   assert_copy_set_hash(mark);
   assert_flat_array_type(mark);
@@ -233,7 +229,6 @@ TEST_VM(markWord, nullable_flat_array_prototype) {
 
   EXPECT_TRUE(mark.has_no_hash());
   EXPECT_FALSE(mark.is_marked());
-  EXPECT_TRUE(mark.decode_pointer() == nullptr);
 
   assert_copy_set_hash(mark);
   assert_flat_array_type(mark);
@@ -258,7 +253,6 @@ TEST_VM(markWord, null_free_array_prototype) {
 
   EXPECT_TRUE(mark.has_no_hash());
   EXPECT_FALSE(mark.is_marked());
-  EXPECT_TRUE(mark.decode_pointer() == nullptr);
 
   assert_copy_set_hash(mark);
   assert_null_free_array_type(mark);