Revert of [Atomics] code stubs for atomic operations

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
index 40e43bba96a9b44f0fddf1afa364bdde37b3748b..436e7be521aa95a0f98071732fba1d4381c354cc 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -509,23 +509,6 @@
                            Label::Distance distance = Label::kFar) {
     test(value, Immediate(kSmiTagMask));
     j(not_zero, not_smi_label, distance);
-  }
-
-  // Jump if the value cannot be represented by a smi.
-  inline void JumpIfNotValidSmiValue(Register value, Register scratch,
-                                     Label* on_invalid,
-                                     Label::Distance distance = Label::kFar) {
-    mov(scratch, value);
-    add(scratch, Immediate(0x40000000U));
-    j(sign, on_invalid, distance);
-  }
-
-  // Jump if the unsigned integer value cannot be represented by a smi.
-  inline void JumpIfUIntNotValidSmiValue(
-      Register value, Label* on_invalid,
-      Label::Distance distance = Label::kFar) {
-    cmp(value, Immediate(0x40000000U));
-    j(above_equal, on_invalid, distance);
   }
 
   void LoadInstanceDescriptors(Register map, Register descriptors);