[turbofan] IA: TruncateFloat64ToFloat32 supports mem operand

src/x64/assembler-x64.cc

Index: src/x64/assembler-x64.cc
diff --git a/src/x64/assembler-x64.cc b/src/x64/assembler-x64.cc
index 01103b234f961eddd5f02dde8bef3ac66addc12b..6e44253ed5218d40cd45395fff2ec337380a89ad 100644
--- a/src/x64/assembler-x64.cc
+++ b/src/x64/assembler-x64.cc
@@ -2761,6 +2761,16 @@ void Assembler::cvtsd2ss(XMMRegister dst, XMMRegister src) {
 }
 
 
+void Assembler::cvtsd2ss(XMMRegister dst, const Operand& src) {
+  EnsureSpace ensure_space(this);
+  emit(0xF2);
+  emit_optional_rex_32(dst, src);
+  emit(0x0F);
+  emit(0x5A);
+  emit_sse_operand(dst, src);
+}
+
+
 void Assembler::cvtsd2si(Register dst, XMMRegister src) {
   EnsureSpace ensure_space(this);
   emit(0xF2);