Reapply r4686: Complete version of full codegen for x64....

src/compiler.cc

 // Copyright 2010 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 103 matching lines @@
   // --always-full-compiler and --always-fast-compiler, which are mutually
   // incompatible.
   CHECK(!FLAG_always_full_compiler || !FLAG_always_fast_compiler);
 
   Handle<SharedFunctionInfo> shared = info->shared_info();
   bool is_run_once = (shared.is_null())
       ? info->scope()->is_global_scope()
       : (shared->is_toplevel() || shared->try_full_codegen());
 
   bool force_full_compiler = false;
-#ifdef V8_TARGET_ARCH_IA32
+#if defined(V8_TARGET_ARCH_IA32) || defined(V8_TARGET_ARCH_X64)
   // On ia32 the full compiler can compile all code whereas the other platforms
   // the constructs supported is checked by the associated syntax checker. When
   // --always-full-compiler is used on ia32 the syntax checker is still in
   // effect, but there is a special flag --force-full-compiler to ignore the
   // syntax checker completely and use the full compiler for all code. Also
   // when debugging on ia32 the full compiler will be used for all code.
   force_full_compiler =
       Debugger::IsDebuggerActive() || FLAG_force_full_compiler;
 #endif
 
@@ skipping 493 matching lines @@
       PROFILE(CodeCreateEvent(Logger::ToNativeByScript(tag, *script),
                               *code, *func_name));
       OPROFILE(CreateNativeCodeRegion(*func_name,
                                       code->instruction_start(),
                                       code->instruction_size()));
     }
   }
 }
 
 } }  // namespace v8::internal