--- old/src/hotspot/share/classfile/vmSymbols.hpp	2018-07-25 11:31:25.519911890 +0100
+++ new/src/hotspot/share/classfile/vmSymbols.hpp	2018-07-25 11:31:25.238911051 +0100
@@ -468,6 +468,7 @@
   template(long_int_signature,                        "(J)I")                                     \
   template(long_long_signature,                       "(J)J")                                     \
   template(long_double_signature,                     "(J)D")                                     \
+  template(long_void_signature,                       "(J)V")                                     \
   template(byte_signature,                            "B")                                        \
   template(char_signature,                            "C")                                        \
   template(double_signature,                          "D")                                        \
@@ -1056,6 +1057,12 @@
   /* support for Unsafe */                                                                                              \
   do_class(jdk_internal_misc_Unsafe,               "jdk/internal/misc/Unsafe")                                          \
                                                                                                                         \
+  do_intrinsic(_writeback0,               jdk_internal_misc_Unsafe,     writeback0_name, long_void_signature , F_RN)             \
+   do_name(     writeback0_name,                                        "writeback0")                                            \
+  do_intrinsic(_writebackPreSync0,        jdk_internal_misc_Unsafe,     writebackPreSync0_name, void_method_signature , F_RN)    \
+   do_name(     writebackPreSync0_name,                                        "writebackPreSync0")                              \
+  do_intrinsic(_writebackPostSync0,        jdk_internal_misc_Unsafe,     writebackPostSync0_name, void_method_signature , F_RN)   \
+   do_name(     writebackPostSync0_name,                                        "writebackPostSync0")                            \
   do_intrinsic(_allocateInstance,         jdk_internal_misc_Unsafe,     allocateInstance_name, allocateInstance_signature, F_RN) \
    do_name(     allocateInstance_name,                                  "allocateInstance")                                      \
    do_signature(allocateInstance_signature,                             "(Ljava/lang/Class;)Ljava/lang/Object;")                 \