[crankshaft] Check if the function is callable before generating a tail call via Call builtin.

test/mjsunit/regress/regress-crbug-595615.js

Index: test/mjsunit/regress/regress-crbug-595615.js
diff --git a/test/mjsunit/regress/regress-crbug-593697-2.js b/test/mjsunit/regress/regress-crbug-595615.js
similarity index 56%
copy from test/mjsunit/regress/regress-crbug-593697-2.js
copy to test/mjsunit/regress/regress-crbug-595615.js
index 1fcbaebd83a2caff31f76b02d895d6c16da28ce9..33095013fa1726d140a411af963c789274ef6594 100644
--- a/test/mjsunit/regress/regress-crbug-593697-2.js
+++ b/test/mjsunit/regress/regress-crbug-595615.js
@@ -6,13 +6,10 @@
 
 "use strict";
 
-%SetForceInlineFlag(Math.cos);
-
-var f5 = (function f6(stdlib) {
-  "use asm";
-  var cos = stdlib.Math.cos;
-  function f5() {
-    return cos();
-  }
-  return { f5: f5 };
-})(this, {}).f5();
+function f(o) {
+  return o.x();
+}
+try { f({ x: 1 }); } catch(e) {}
+try { f({ x: 1 }); } catch(e) {}
+%OptimizeFunctionOnNextCall(f);
+try { f({ x: 1 }); } catch(e) {}