Introduce runtime function %OptimizeFunctionOnNextCall to manually trigger optimization.

test/mjsunit/compiler/simple-deopt.js

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+// Flags: --allow-natives-syntax
+
 function f(x) {
   return ~x;
 }
 
 f(42);
 assertEquals(~12, f(12.45));
 assertEquals(~42, f(42.87));
 
 
 var a = 1, b = 2, c = 4, d = 8;
@@ skipping 14 matching lines @@
 g = function() { return 42; };
 assertEquals(42, h());
 
 
 // Test deopt when map changes.
 var obj = {};
 obj.g = g;
 function k(o) {
   return o.g();
 }
-for (var i = 0; i < 1000000; i++) k(obj);
+for (var i = 0; i < 5; i++) k(obj);
+%OptimizeFunctionOnNextCall(k);
+k(obj);
 assertEquals(42, k(obj));
 assertEquals(87, k({g: function() { return 87; }}));
 
 
 // Test deopt with assignments to parameters.
 function p(x,y) {
   x = 42;
   y = 1;
   y = y << "0";
   return x | y;
 }
 assertEquals(43, p(0,0));
 
 
 // Test deopt with literals on the expression stack.
 function LiteralToStack(x) {
   return 'lit[' + (x + ']');
 }
 
 assertEquals('lit[-87]', LiteralToStack(-87));
 assertEquals('lit[0]', LiteralToStack(0));
 assertEquals('lit[42]', LiteralToStack(42));
 
 
 // Test deopt before call.
 var str = "abc";
 var r;
 function CallCharAt(n) { return str.charAt(n); }
-for (var i = 0; i < 1000000; i++) {
+for (var i = 0; i < 5; i++) {
   r = CallCharAt(0);
 }
+%OptimizeFunctionOnNextCall(CallCharAt);
+r = CallCharAt(0);
 assertEquals("a", r);
 
 
 // Test of deopt in presence of spilling.
 function add4(a,b,c,d) {
   return a+b+c+d;
 }
 assertEquals(0x40000003, add4(1,1,2,0x3fffffff));