Make translation of modulus operation '--stress-opt'-proof.

Note that we unconditionally deopt later, anyway, but our compilation
pipeline has to survive long enough to reach that place. :-/

LOG=y
BUG=352059
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/198833002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19884 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/hydrogen.cc

@@ -9225,13 +9225,8 @@ HValue* HGraphBuilder::BuildBinaryOperation(
         instr = AddUncasted<HMul>(left, right);
         break;
       case Token::MOD: {
-        if (fixed_right_arg.has_value) {
-          if (right->IsConstant()) {
-            HConstant* c_right = HConstant::cast(right);
-            if (c_right->HasInteger32Value()) {
-              ASSERT_EQ(fixed_right_arg.value, c_right->Integer32Value());
-            }
-          } else {
+        if (fixed_right_arg.has_value &&
+            !right->EqualsInteger32Constant(fixed_right_arg.value)) {
           HConstant* fixed_right = Add<HConstant>(
               static_cast<int>(fixed_right_arg.value));
           IfBuilder if_same(this);
@@ -9240,7 +9235,6 @@ HValue* HGraphBuilder::BuildBinaryOperation(
           if_same.ElseDeopt("Unexpected RHS of binary operation");
           right = fixed_right;
         }
-        }
         instr = AddUncasted<HMod>(left, right);
         break;
       }

test/mjsunit/regress/regress-352059.js

+// Copyright 2014 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
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+var foo = false;
+
+function bar() {
+  foo = 2;
+  return 4 % foo;
+}
+
+bar();