S390: Use TM instead of TMLL in case of memory operand.

src/s390/macro-assembler-s390.h

Index: src/s390/macro-assembler-s390.h
diff --git a/src/s390/macro-assembler-s390.h b/src/s390/macro-assembler-s390.h
index 2970b01b8757bcb661fc2211d9d08e1b1bec2f76..c6c77820a985b7729c4f3ead111d59a318107be9 100644
--- a/src/s390/macro-assembler-s390.h
+++ b/src/s390/macro-assembler-s390.h
@@ -1552,6 +1552,17 @@ class MacroAssembler : public Assembler {
 
   inline void TestIfSmi(Register value) { tmll(value, Operand(1)); }
 
+  inline void TestIfSmi(MemOperand value) {
+    if (is_uint12(value.offset())) {
+      tm(value, Operand(1));
+    } else if (is_int20(value.offset())) {
+      tmy(value, Operand(1));
+    } else {
+      LoadP(r0, value);
+      tmll(r0, Operand(1));
+    }
+  }
+
   inline void TestIfPositiveSmi(Register value, Register scratch) {
     STATIC_ASSERT((kSmiTagMask | kSmiSignMask) ==
                   (intptr_t)(1UL << (kBitsPerPointer - 1) | 1));