NOT FOR COMMITTING: Add fast side-effect free floating point expressions.

src/SConscript

 # Copyright 2008 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 148 matching lines @@
     ia32/debug-ia32.cc
     ia32/disasm-ia32.cc
     ia32/fast-codegen-ia32.cc
     ia32/frames-ia32.cc
     ia32/full-codegen-ia32.cc
     ia32/ic-ia32.cc
     ia32/jump-target-ia32.cc
     ia32/macro-assembler-ia32.cc
     ia32/regexp-macro-assembler-ia32.cc
     ia32/register-allocator-ia32.cc
+    ia32/safe-codegen-ia32.cc
     ia32/stub-cache-ia32.cc
     ia32/virtual-frame-ia32.cc
     """),
   'arch:x64': Split("""
     fast-codegen.cc
     x64/assembler-x64.cc
     x64/builtins-x64.cc
     x64/codegen-x64.cc
     x64/cpu-x64.cc
     x64/debug-x64.cc
@@ skipping 126 matching lines @@
       snapshot_cc = Command('snapshot.cc', [], [])
     snapshot_obj = context.ConfigureObject(env, snapshot_cc, CPPPATH=['.'])
   else:
     snapshot_obj = empty_snapshot_obj
   library_objs = [non_snapshot_files, libraries_obj, snapshot_obj]
   return (library_objs, d8_objs, [mksnapshot])
 
 
 (library_objs, d8_objs, mksnapshot) = ConfigureObjectFiles()
 Return('library_objs d8_objs mksnapshot')