Handle non-object constants in HConstant::GetMonomorphicJSObjectMap.

test/mjsunit/regress/regress-412162.js

Index: test/mjsunit/regress/regress-412162.js
diff --git a/test/mjsunit/regress/regress-crbug-387636.js b/test/mjsunit/regress/regress-412162.js
similarity index 65%
copy from test/mjsunit/regress/regress-crbug-387636.js
copy to test/mjsunit/regress/regress-412162.js
index 1e50ace45a293c8561042f1a09c8fcd505b43dc2..6a7ad0c57fce5cd7b95062bafdccbc34e1dcdfab 100644
--- a/test/mjsunit/regress/regress-crbug-387636.js
+++ b/test/mjsunit/regress/regress-412162.js
@@ -4,11 +4,11 @@
 
 // Flags: --allow-natives-syntax
 
-function f() {
-  [].indexOf(0x40000000);
+function test() {
+  Math.abs(-NaN).toString();
 }
 
-f();
-f();
-%OptimizeFunctionOnNextCall(f);
-f();
+test();
+test();
+%OptimizeFunctionOnNextCall(test);
+test();