8332678: Serial: Remove use of should_clear_all_soft_refs in serial folder

Reviewed-by: iwalulya

src/hotspot/share/gc/serial/serialFullGC.cpp

@@ -685,11 +685,6 @@ void SerialFullGC::invoke_at_safepoint(bool clear_all_softrefs) {
   assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
 
   SerialHeap* gch = SerialHeap::heap();
-#ifdef ASSERT
-  if (gch->soft_ref_policy()->should_clear_all_soft_refs()) {
-    assert(clear_all_softrefs, "Policy should have been checked earlier");
-  }
-#endif
 
   gch->trace_heap_before_gc(_gc_tracer);
 

src/hotspot/share/gc/serial/serialHeap.cpp

@@ -559,9 +559,6 @@ HeapWord* SerialHeap::satisfy_failed_allocation(size_t size, bool is_tlab) {
     return result;
   }
 
-  assert(!soft_ref_policy()->should_clear_all_soft_refs(),
-    "Flag should have been handled and cleared prior to this point");
-
   // What else?  We might try synchronous finalization later.  If the total
   // space available is large enough for the allocation, then a more
   // complete compaction phase than we've tried so far might be