Revert r11420 because Win32 compilation was broken.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
===================================================================
--- src/hydrogen-instructions.cc	(revision 11420)
+++ src/hydrogen-instructions.cc	(working copy)
@@ -931,62 +931,6 @@
 }
 
 
-HValue* HUnaryMathOperation::Canonicalize() {
-  if (op() == kMathFloor) {
-    // If the input is integer32 then we replace the floor instruction
-    // with its input. This happens before the representation changes are
-    // introduced.
-    if (value()->representation().IsInteger32()) return value();
-
-#ifdef V8_TARGET_ARCH_ARM
-    if (value()->IsDiv() && (value()->UseCount() == 1)) {
-      // TODO(2038): Implement this optimization for non ARM architectures.
-      HDiv* hdiv = HDiv::cast(value());
-      HValue* left = hdiv->left();
-      HValue* right = hdiv->right();
-      // Try to simplify left and right values of the division.
-      HValue* new_left =
-        LChunkBuilder::SimplifiedDividendForMathFloorOfDiv(left);
-      HValue* new_right =
-        LChunkBuilder::SimplifiedDivisorForMathFloorOfDiv(right);
-
-      // Return if left or right are not optimizable.
-      if ((new_left == NULL) || (new_right == NULL)) return this;
-
-      // Insert the new values in the graph.
-      if (new_left->IsInstruction() &&
-          !HInstruction::cast(new_left)->IsLinked()) {
-        HInstruction::cast(new_left)->InsertBefore(this);
-      }
-      if (new_right->IsInstruction() &&
-          !HInstruction::cast(new_right)->IsLinked()) {
-        HInstruction::cast(new_right)->InsertBefore(this);
-      }
-      HMathFloorOfDiv* instr =  new HMathFloorOfDiv(context(),
-          new_left,
-          new_right);
-      // Replace this HMathFloor instruction by the new HMathFloorOfDiv.
-      instr->InsertBefore(this);
-      ReplaceAllUsesWith(instr);
-      Kill();
-      // We know the division had no other uses than this HMathFloor. Delete it.
-      // Also delete the arguments of the division if they are not used any
-      // more.
-      hdiv->DeleteAndReplaceWith(NULL);
-      ASSERT(left->IsChange() || left->IsConstant());
-      ASSERT(right->IsChange() || right->IsConstant());
-      if (left->HasNoUses())  left->DeleteAndReplaceWith(NULL);
-      if (right->HasNoUses())  right->DeleteAndReplaceWith(NULL);
-
-      // Return NULL to remove this instruction from the graph.
-      return NULL;
-    }
-#endif  // V8_TARGET_ARCH_ARM
-  }
-  return this;
-}
-
-
 HValue* HCheckInstanceType::Canonicalize() {
   if (check_ == IS_STRING &&
       !value()->type().IsUninitialized() &&