Fix end calculation

Author: Rickard Bäckman

src/hotspot/share/runtime/continuation.cpp

@@ -3931,7 +3931,11 @@ class Thaw {
     // }
     OrderAccess::loadload(); // we must test the gc mode *after* the copy
     if (UNLIKELY(should_fix(chunk))) {
-      fix_stack_chunk(chunk, vsp, vsp + size);
+      intptr_t* end = vsp + size - argsize;
+      if (argsize > 0) {
+        end -= 2; // RON FIXME, document!
+      }
+      fix_stack_chunk(chunk, vsp, end);
       if (empty) {
         // we've set 
         jdk_internal_misc_StackChunk::set_gc_mode(chunk, false);