8346921: Remove unused arg in markWord::must_be_preserved

Reviewed-by: kbarrett, tschatzl

Author: albertnetymk

src/hotspot/share/oops/markWord.hpp

@@ -188,7 +188,7 @@ class markWord {
   static markWord INFLATING() { return zero(); }    // inflate-in-progress
 
   // Should this header be preserved during GC?
-  bool must_be_preserved(const oopDesc* obj) const {
+  bool must_be_preserved() const {
     return (!is_unlocked() || !has_no_hash());
   }
 

src/hotspot/share/oops/oop.inline.hpp

@@ -452,7 +452,7 @@ bool oopDesc::mark_must_be_preserved() const {
 }
 
 bool oopDesc::mark_must_be_preserved(markWord m) const {
-  return m.must_be_preserved(this);
+  return m.must_be_preserved();
 }
 
 #endif // SHARE_OOPS_OOP_INLINE_HPP