[turbofan] Add dedicated test for check constant folding.

test/mjsunit/compiler/dont-constant-fold-deopting-checks.js

Index: test/mjsunit/compiler/dont-constant-fold-deopting-checks.js
diff --git a/test/mjsunit/regress/regress-5006.js b/test/mjsunit/compiler/dont-constant-fold-deopting-checks.js
similarity index 66%
copy from test/mjsunit/regress/regress-5006.js
copy to test/mjsunit/compiler/dont-constant-fold-deopting-checks.js
index 29f145de0ac38c971c0c9174a83ea0cee285bb18..02bd8d9a257a6effbf7c736143f214077ed8ad4b 100644
--- a/test/mjsunit/regress/regress-5006.js
+++ b/test/mjsunit/compiler/dont-constant-fold-deopting-checks.js
@@ -4,8 +4,7 @@
 
 // Flags: --allow-natives-syntax
 
-function foo(x) { return Math.imul(x|0, 2); }
-print(foo(1));
-print(foo(1));
+function bar(a) { a[0](true); }
+function foo(a) { return bar(1); }
 %OptimizeFunctionOnNextCall(foo);
-print(foo(1));
+assertThrows(function() {bar([foo])}, TypeError);