[compiler] Drop the CompareNilIC.

src/crankshaft/hydrogen-instructions.cc

Index: src/crankshaft/hydrogen-instructions.cc
diff --git a/src/crankshaft/hydrogen-instructions.cc b/src/crankshaft/hydrogen-instructions.cc
index f1a446c777ab588c5382a5296eb2e452d6603ddb..3c3ae355ae5fc1f4b22c83ff38647ea95af8608c 100644
--- a/src/crankshaft/hydrogen-instructions.cc
+++ b/src/crankshaft/hydrogen-instructions.cc
@@ -3238,6 +3238,17 @@ bool HIsUndetectableAndBranch::KnownSuccessorBlock(HBasicBlock** block) {
         ? FirstSuccessor() : SecondSuccessor();
     return true;
   }
+  if (value()->type().IsNull() || value()->type().IsUndefined()) {
+    *block = FirstSuccessor();
+    return true;
+  }
+  if (value()->type().IsBoolean() ||
+      value()->type().IsSmi() ||
+      value()->type().IsString() ||
+      value()->type().IsJSReceiver()) {
+    *block = SecondSuccessor();
+    return true;
+  }
   *block = NULL;
   return false;
 }