Revert of Replace all remaining Oddball checks with new function

src/full-codegen/x64/full-codegen-x64.cc

Index: src/full-codegen/x64/full-codegen-x64.cc
diff --git a/src/full-codegen/x64/full-codegen-x64.cc b/src/full-codegen/x64/full-codegen-x64.cc
index a56c127eb590f5c48a9204834252376e51fcc1c3..f50b0d0896e3c66466147d53c1e8ae8f92f98acb 100644
--- a/src/full-codegen/x64/full-codegen-x64.cc
+++ b/src/full-codegen/x64/full-codegen-x64.cc
@@ -504,12 +504,11 @@
                                           true,
                                           true_label_,
                                           false_label_);
-  DCHECK(lit->IsNull(isolate()) || lit->IsUndefined(isolate()) ||
+  DCHECK(lit->IsNull() || lit->IsUndefined(isolate()) ||
          !lit->IsUndetectable());
-  if (lit->IsUndefined(isolate()) || lit->IsNull(isolate()) ||
-      lit->IsFalse(isolate())) {
+  if (lit->IsUndefined(isolate()) || lit->IsNull() || lit->IsFalse()) {
     if (false_label_ != fall_through_) __ jmp(false_label_);
-  } else if (lit->IsTrue(isolate()) || lit->IsJSObject()) {
+  } else if (lit->IsTrue() || lit->IsJSObject()) {
     if (true_label_ != fall_through_) __ jmp(true_label_);
   } else if (lit->IsString()) {
     if (String::cast(*lit)->length() == 0) {