Fix Crankshafted CompareNil of constant values

test/mjsunit/constant-compare-nil-value.js

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 // Flags: --allow-natives-syntax
 
-function foo(word, nBits) {
-  return (word[1] >>> nBits) | (word[0] << (32 - nBits));
+function inlined() {
+    return 1;
 }
 
-word = [0x1001, 0];
+function foo() {
+    if ((inlined() + 0.5) == null) return "null";
+    return "non-null";
+}
 
-var expected = foo(word, 1);
-foo(word, 1);
+assertEquals("non-null", foo());
+assertEquals("non-null", foo());
 %OptimizeFunctionOnNextCall(foo);
-var optimized = foo(word, 1);
-assertEquals(expected, optimized)
+assertEquals("non-null", foo());