Use a fixed random seed per default.

Makefile

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 86 matching lines @@
   GYPFLAGS += -Dv8_optimized_debug=1
 endif
 # debuggersupport=off
 ifeq ($(debuggersupport), off)
   GYPFLAGS += -Dv8_enable_debugger_support=0
 endif
 # unalignedaccess=on
 ifeq ($(unalignedaccess), on)
   GYPFLAGS += -Dv8_can_use_unaligned_accesses=true
 endif
+# randomseed=12345, disable random seed via randomseed=0
+ifdef randomseed
+  GYPFLAGS += -Dv8_random_seed=$(randomseed)
+endif
 # soname_version=1.2.3
 ifdef soname_version
   GYPFLAGS += -Dsoname_version=$(soname_version)
 endif
 # werror=no
 ifeq ($(werror), no)
   GYPFLAGS += -Dwerror=''
 endif
 # presubmit=no
 ifeq ($(presubmit), no)
@@ skipping 297 matching lines @@
         @$(OUTDIR)/ia32.release/d8 --dump-heap-constants >> $(DUMP_FILE)
 
 # Dependencies.
 # Remember to keep these in sync with the DEPS file.
 dependencies:
         svn checkout --force http://gyp.googlecode.com/svn/trunk build/gyp \
             --revision 1685
         svn checkout --force \
             https://src.chromium.org/chrome/trunk/deps/third_party/icu46 \
             third_party/icu --revision 214189