Drop thenable coercion cache

test/mjsunit/es6/regress/regress-cr372788.js

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 //
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 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --allow-natives-syntax
 
-var o = {a:1.5};
-o.a = 0;
-var a = o.a;
+var x = 0;
+var y = 0;
 
-function g() {
-  return 1;
+var thenable = { then: function(f) { x++; f(); } };
+
+for (var i = 0; i < 3; ++i) {
+  Promise.resolve(thenable).then(function() { x++; y++; });
 }
+assertEquals(0, x);
 
-var o2 = {a:{}};
-
-function f() {
-  var result = {a: a};
-  var literal = {x:g()};
-  return [result, literal];
-}
-
-f();
-f();
-%OptimizeFunctionOnNextCall(f);
-assertEquals(1, f()[1].x);
+(function check() {
+  Promise.resolve().chain(function() {
+    // Delay check until all handlers have run.
+    if (y < 3) check(); else assertEquals(6, x);
+  }).catch(function(e) { %AbortJS("FAILURE: " + e) });
+})();