Avoid fast short-cut in Map::GeneralizeRepresentation() for literals with non-simple transitions.

test/mjsunit/regress/regress-3687.js

Index: test/mjsunit/regress/regress-3687.js
diff --git a/test/mjsunit/regress/regress-crbug-357330.js b/test/mjsunit/regress/regress-3687.js
similarity index 56%
copy from test/mjsunit/regress/regress-crbug-357330.js
copy to test/mjsunit/regress/regress-3687.js
index b3edf00843e1a9d202212c24d96dc3ad5d027f12..e1df1b4e1d3dbef376a13a2e80e7fb543ee639b9 100644
--- a/test/mjsunit/regress/regress-crbug-357330.js
+++ b/test/mjsunit/regress/regress-3687.js
@@ -4,13 +4,19 @@
 
 // Flags: --allow-natives-syntax
 
-function f(foo) {
-  var g;
-  true ? (g = foo + 0) : g = null;
-  if (null != g) {}
-};
+var t1 = { f1: 0 };
+var t2 = { f2: 0 };
 
-f(1.4);
-f(1.4);
-%OptimizeFunctionOnNextCall(f);
-f(1.4);
+var z = {
+  x: {
+    x: t1,
+    y: {
+      x: {},
+      z1: {
+        x: t2,
+        y: 1
+      }
+    }
+  },
+  z2: 0
+};