[turbofan] Optimize division/modulus by constant.

src/compiler/x64/instruction-selector-x64.cc

Index: src/compiler/x64/instruction-selector-x64.cc
diff --git a/src/compiler/x64/instruction-selector-x64.cc b/src/compiler/x64/instruction-selector-x64.cc
index 6a3d9c03fee05e0ae566811bcd0e5605b0628df5..d102e847181f3c8deec72497659bc9d5adf407bd 100644
--- a/src/compiler/x64/instruction-selector-x64.cc
+++ b/src/compiler/x64/instruction-selector-x64.cc
@@ -546,6 +546,16 @@ void InstructionSelector::VisitInt64Mul(Node* node) {
 }
 
 
+void InstructionSelector::VisitInt32MulHigh(Node* node) {
+  X64OperandGenerator g(this);
+  InstructionOperand* temps[] = {g.TempRegister(rax)};
+  size_t temp_count = arraysize(temps);
+  Emit(kX64ImulHigh32, g.DefineAsFixed(node, rdx),
+       g.UseFixed(node->InputAt(0), rax), g.UseRegister(node->InputAt(1)),
+       temp_count, temps);
+}
+
+
 static void VisitDiv(InstructionSelector* selector, Node* node,
                      ArchOpcode opcode) {
   X64OperandGenerator g(selector);