--- old/src/hotspot/share/asm/assembler.cpp	2018-11-07 15:46:22.738982021 +0100
+++ new/src/hotspot/share/asm/assembler.cpp	2018-11-07 15:46:22.597983304 +0100
@@ -326,7 +326,7 @@
     }
   }
 #endif
-  intptr_t start = (intptr_t)-cell_header_size;
+  intptr_t start = -cell_header_size;
   intptr_t end = start + region_size;
   return int_address >= start && int_address < end;
 }