Implement support for Math.imul in Crankshaft.

src/math.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 195 matching lines @@
   if (!IS_NUMBER(x)) x = NonNumberToNumber(x);
   return %_MathSqrt(x);
 }
 
 // ECMA 262 - 15.8.2.18
 function MathTan(x) {
   if (!IS_NUMBER(x)) x = NonNumberToNumber(x);
   return %_MathTan(x);
 }
 
+// Non-standard extension.
+function MathImul(x, y) {
+  if (!IS_NUMBER(x)) x = NonNumberToNumber(x);
+  if (!IS_NUMBER(y)) y = NonNumberToNumber(y);
+  return %NumberImul(x, y);

[Sven Panne, 2013/04/29 06:36:00]

I think the right way to implement this would be renaming this to "_MathImul",
add kMathImul to INLINE_FUNCTION_LIST instead of RUNTIME_FUNCTION_LIST_ALWAYS,
and implement a HOptimizedGraphBuilder::GenerateMathImul.

As it is, I am relatively sure that we get some bailouts, though I haven't
tested it.

+}
+
 
 // -------------------------------------------------------------------
 
 function SetUpMath() {
   %CheckIsBootstrapping();
 
   %SetPrototype($Math, $Object.prototype);
   %SetProperty(global, "Math", $Math, DONT_ENUM);
   %FunctionSetInstanceClassName(MathConstructor, 'Math');
 
@@ skipping 50 matching lines @@
     "exp", MathExp,
     "floor", MathFloor,
     "log", MathLog,
     "round", MathRound,
     "sin", MathSin,
     "sqrt", MathSqrt,
     "tan", MathTan,
     "atan2", MathAtan2,
     "pow", MathPow,
     "max", MathMax,
-    "min", MathMin
+    "min", MathMin,
+    "imul", MathImul
   ));
 }
 
 SetUpMath();