X64: Move some methods in x64/ to their file and make codegen do int3.

src/x64/builtins-x64.cc

Index: src/x64/builtins-x64.cc
diff --git a/src/x64/builtins-x64.cc b/src/x64/builtins-x64.cc
index 209aa2d3070e48da7890e9457e64fe4718cfd782..3cb0f9645aca06271c24f40b1d254db2ae4e4547 100644
--- a/src/x64/builtins-x64.cc
+++ b/src/x64/builtins-x64.cc
@@ -25,3 +25,40 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+#include "v8.h"
+#include "codegen-inl.h"
+
+namespace v8 { namespace internal {
+
+void Builtins::Generate_Adaptor(MacroAssembler* masm,
+                                Builtins::CFunctionId id) {
+  masm->int3();  // UNIMPLEMENTED.
+}
+
+void Builtins::Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm) {
+  masm->int3();  // UNIMPLEMENTED.
+}
+
+void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
+  masm->int3();  // UNIMPLEMENTED.
+}
+
+void Builtins::Generate_FunctionCall(MacroAssembler* masm) {
+  masm->int3();  // UNIMPLEMENTED.
+}
+
+void Builtins::Generate_JSConstructCall(MacroAssembler* masm) {
+  masm->int3();  // UNIMPLEMENTED.
+}
+
+void Builtins::Generate_JSConstructEntryTrampoline(MacroAssembler* masm) {
+  masm->int3();  // UNIMPLEMENTED.
+}
+
+void Builtins::Generate_JSEntryTrampoline(MacroAssembler* masm) {
+  masm->int3();  // UNIMPLEMENTED.
+}
+
+} }  // namespace v8::internal
+
+