Use UnboxedInt32 and UnboxedUint32 representation for LoadIndexedInstr

runtime/vm/assembler_x64.cc

Index: runtime/vm/assembler_x64.cc
diff --git a/runtime/vm/assembler_x64.cc b/runtime/vm/assembler_x64.cc
index 2c5a9fe2190ea360b41ddf2a7cc24d1eef60fee0..771e8f66aa2b2c70dedbae2cb76460dc6a07cbed 100644
--- a/runtime/vm/assembler_x64.cc
+++ b/runtime/vm/assembler_x64.cc
@@ -1301,6 +1301,18 @@ void Assembler::cvtsi2sd(XmmRegister dst, Register src) {
 }
 
 
+void Assembler::cvtsi2sd32(XmmRegister dst, Register src) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  ASSERT(dst <= XMM15);
+  Operand operand(src);
+  EmitUint8(0xF2);
+  EmitOperandREX(dst, operand, REX_NONE);
+  EmitUint8(0x0F);
+  EmitUint8(0x2A);
+  EmitOperand(dst & 7, operand);
+}
+
+
 void Assembler::cvttsd2siq(Register dst, XmmRegister src) {
   ASSERT(src <= XMM15);
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);