S390: [stubs] Split ToNumberStub into reusable subparts.

src/s390/macro-assembler-s390.cc

Index: src/s390/macro-assembler-s390.cc
diff --git a/src/s390/macro-assembler-s390.cc b/src/s390/macro-assembler-s390.cc
index 789fa5d575d09efb569e6af647c1b94446e6f37c..79447bf91abe685b5f82323a1875ecd6b3e55b56 100644
--- a/src/s390/macro-assembler-s390.cc
+++ b/src/s390/macro-assembler-s390.cc
@@ -2925,6 +2925,18 @@ void MacroAssembler::JumpIfEitherSmi(Register reg1, Register reg2,
   JumpIfSmi(reg2, on_either_smi);
 }
 
+void MacroAssembler::AssertNotNumber(Register object) {
+  if (emit_debug_code()) {
+    STATIC_ASSERT(kSmiTag == 0);
+    TestIfSmi(object);
+    Check(ne, kOperandIsANumber, cr0);

[JoranSiu, 2016/03/22 20:05:59]

We probably should clean up the conditional reg parameter (last one), as its not
used and unnecessary on S390. 

+    push(object);
+    CompareObjectType(object, object, object, HEAP_NUMBER_TYPE);
+    pop(object);
+    Check(ne, kOperandIsANumber);
+  }
+}
+
 void MacroAssembler::AssertNotSmi(Register object) {
   if (emit_debug_code()) {
     STATIC_ASSERT(kSmiTag == 0);