Implement support for Math.imul in Crankshaft.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 9ca78ccc84454c2f20140f22614b5951b79911e9..346b445dadc33ef0eeda9cd15617769629fdd1fd 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -8718,6 +8718,18 @@ bool HOptimizedGraphBuilder::TryInlineBuiltinFunctionCall(Call* expr,
         return true;
       }
       break;
+    case kMathImul:
+      if (expr->arguments()->length() == 2) {
+        HValue* right = Pop();
+        HValue* left = Pop();
+        Drop(1);  // Receiver.
+        HValue* context = environment()->LookupContext();
+        HInstruction* op = HMul::NewImul(zone(), context, left, right);
+        if (drop_extra) Drop(1);  // Optionally drop the function.
+        ast_context()->ReturnInstruction(op, expr->id());
+        return true;
+      }
+      break;
     default:
       // Not supported for inlining yet.
       break;
@@ -8865,6 +8877,18 @@ bool HOptimizedGraphBuilder::TryInlineBuiltinMethodCall(
         return true;
       }
       break;
+    case kMathImul:
+      if (argument_count == 3 && check_type == RECEIVER_MAP_CHECK) {
+        AddCheckConstantFunction(expr->holder(), receiver, receiver_map);
+        HValue* right = Pop();
+        HValue* left = Pop();
+        Drop(1);  // Receiver.
+        HValue* context = environment()->LookupContext();
+        HInstruction* result = HMul::NewImul(zone(), context, left, right);
+        ast_context()->ReturnInstruction(result, expr->id());
+        return true;
+      }
+      break;
     default:
       // Not yet supported for inlining.
       break;