Add support for keyed-call on arrays of fast elements

test/mjsunit/keyed-array-call.js

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-// Flags: --allow-natives-syntax
-
-function f(x) {
-  x++;
-  return x;
+var a = [function(a) { return a+10; },
+         function(a) { return a+20; }];
+a.test = function(a) { return a+30; }

[danno, 2013/10/02 08:49:11]

How about tests that actually test the holey version, too?

+function f(i) {
+  return "r" + (1, a[i](i+1), a[i](i+2));
 }
 
-f(0.5);
-f(0.5);
-%OptimizeFunctionOnNextCall(f);
-f(0.5);
-assertOptimized(f);
+assertEquals("r12", f(0));
+assertEquals("r12", f(0));
+assertEquals("r23", f(1));
+assertEquals("r23", f(1));
+
+// Deopt the stub.
+assertEquals("rtest230", f("test"));