Fix Type::Intersect to skip uninhabited bitsets

test/mjsunit/regress/regress-crbug-357330.js

Index: test/mjsunit/regress/regress-crbug-357330.js
diff --git a/test/mjsunit/regress/regress-347909.js b/test/mjsunit/regress/regress-crbug-357330.js
similarity index 66%
copy from test/mjsunit/regress/regress-347909.js
copy to test/mjsunit/regress/regress-crbug-357330.js
index 90a8e6a759eab76afef1dc968c814bd9d324b147..b3edf00843e1a9d202212c24d96dc3ad5d027f12 100644
--- a/test/mjsunit/regress/regress-347909.js
+++ b/test/mjsunit/regress/regress-crbug-357330.js
@@ -4,16 +4,13 @@
 
 // Flags: --allow-natives-syntax
 
-var a = {y:1.5};
-a.y = 0;
-var b = a.y;
-a.y = {};
-var d = 1;
-function f() {
-  d = 0;
-  return {y: b};
-}
-f();
-f();
+function f(foo) {
+  var g;
+  true ? (g = foo + 0) : g = null;
+  if (null != g) {}
+};
+
+f(1.4);
+f(1.4);
 %OptimizeFunctionOnNextCall(f);
-f();
+f(1.4);