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

src/x64/macro-assembler-x64.cc

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+#include "v8.h"
+
+#include "bootstrapper.h"
+#include "codegen-inl.h"
+
+namespace v8 { namespace internal {
+
+MacroAssembler::MacroAssembler(void* buffer, int size)
+  : Assembler(buffer, size),
+    unresolved_(0),
+    generating_stub_(false),
+    allow_stub_calls_(true),
+    code_object_(Heap::undefined_value()) {
+}
+
+void MacroAssembler::TailCallRuntime(ExternalReference const& a, int b) {
+  UNIMPLEMENTED();
+}
+
+} }  // namespace v8::internal