Revert of [compiler] Drop the CompareNilIC.

src/full-codegen/mips64/full-codegen-mips64.cc

Index: src/full-codegen/mips64/full-codegen-mips64.cc
diff --git a/src/full-codegen/mips64/full-codegen-mips64.cc b/src/full-codegen/mips64/full-codegen-mips64.cc
index 70ae080d33641b1188ec4e9c407aa9e9e358923d..544d291d17840ab9865c68ff9f2020ce28ddb02d 100644
--- a/src/full-codegen/mips64/full-codegen-mips64.cc
+++ b/src/full-codegen/mips64/full-codegen-mips64.cc
@@ -4051,18 +4051,18 @@
 
   VisitForAccumulatorValue(sub_expr);
   PrepareForBailoutBeforeSplit(expr, true, if_true, if_false);
+  __ mov(a0, result_register());
   if (expr->op() == Token::EQ_STRICT) {
     Heap::RootListIndex nil_value = nil == kNullValue ?
         Heap::kNullValueRootIndex :
         Heap::kUndefinedValueRootIndex;
     __ LoadRoot(a1, nil_value);
+    Split(eq, a0, Operand(a1), if_true, if_false, fall_through);
+  } else {
+    Handle<Code> ic = CompareNilICStub::GetUninitialized(isolate(), nil);
+    CallIC(ic, expr->CompareOperationFeedbackId());
+    __ LoadRoot(a1, Heap::kTrueValueRootIndex);
     Split(eq, v0, Operand(a1), if_true, if_false, fall_through);
-  } else {
-    __ JumpIfSmi(v0, if_false);
-    __ ld(v0, FieldMemOperand(v0, HeapObject::kMapOffset));
-    __ lbu(a1, FieldMemOperand(v0, Map::kBitFieldOffset));
-    __ And(a1, a1, Operand(1 << Map::kIsUndetectable));
-    Split(ne, a1, Operand(zero_reg), if_true, if_false, fall_through);
   }
   context()->Plug(if_true, if_false);
 }