[turbofan] Emit memory operands for cmp and test on ia32 and x64 when it makes sense.

src/ia32/assembler-ia32.cc

Index: src/ia32/assembler-ia32.cc
diff --git a/src/ia32/assembler-ia32.cc b/src/ia32/assembler-ia32.cc
index a846c934508ac624c708b19583716a0d2c162c43..2ac3088020bbd5d76577813dfa7c84f644b46ee3 100644
--- a/src/ia32/assembler-ia32.cc
+++ b/src/ia32/assembler-ia32.cc
@@ -803,6 +803,11 @@ void Assembler::cmp(Register reg, const Operand& op) {
   emit_operand(reg, op);
 }
 
+void Assembler::cmp(const Operand& op, Register reg) {
+  EnsureSpace ensure_space(this);
+  EMIT(0x39);
+  emit_operand(reg, op);
+}
 
 void Assembler::cmp(const Operand& op, const Immediate& imm) {
   EnsureSpace ensure_space(this);