Revert "Load/Store cannot handle double representation."

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index 27900c1eef739719ef98b0041446f83b666df6ca..b301f29e31f804cdca1817216414d1b3f354fa5e 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -948,6 +948,7 @@ void MacroAssembler::Cvtlsi2sd(XMMRegister dst, const Operand& src) {
 
 
 void MacroAssembler::Load(Register dst, const Operand& src, Representation r) {
+  ASSERT(!r.IsDouble());
   if (r.IsByte()) {
     movzxbl(dst, src);
   } else if (r.IsInteger32()) {
@@ -959,6 +960,7 @@ void MacroAssembler::Load(Register dst, const Operand& src, Representation r) {
 
 
 void MacroAssembler::Store(const Operand& dst, Register src, Representation r) {
+  ASSERT(!r.IsDouble());
   if (r.IsByte()) {
     movb(dst, src);
   } else if (r.IsInteger32()) {