Don't create dummy uses for control dependencies.

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/149513002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18900 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/lithium-arm.cc

@@ -847,10 +847,12 @@ void LChunkBuilder::VisitInstruction(HInstruction* current) {
     if (current->OperandCount() == 0) {
       instr = DefineAsRegister(new(zone()) LDummy());
     } else {
+      ASSERT(!current->OperandAt(0)->IsControlInstruction());
       instr = DefineAsRegister(new(zone())
           LDummyUse(UseAny(current->OperandAt(0))));
     }
     for (int i = 1; i < current->OperandCount(); ++i) {
+      if (current->OperandAt(i)->IsControlInstruction()) continue;
       LInstruction* dummy =
           new(zone()) LDummyUse(UseAny(current->OperandAt(i)));
       dummy->set_hydrogen_value(current);

src/ia32/lithium-ia32.cc

@@ -911,10 +911,12 @@ void LChunkBuilder::VisitInstruction(HInstruction* current) {
     if (current->OperandCount() == 0) {
       instr = DefineAsRegister(new(zone()) LDummy());
     } else {
+      ASSERT(!current->OperandAt(0)->IsControlInstruction());
       instr = DefineAsRegister(new(zone())
           LDummyUse(UseAny(current->OperandAt(0))));
     }
     for (int i = 1; i < current->OperandCount(); ++i) {
+      if (current->OperandAt(i)->IsControlInstruction()) continue;
       LInstruction* dummy =
           new(zone()) LDummyUse(UseAny(current->OperandAt(i)));
       dummy->set_hydrogen_value(current);

src/mips/lithium-mips.cc

@@ -855,10 +855,12 @@ void LChunkBuilder::VisitInstruction(HInstruction* current) {
     if (current->OperandCount() == 0) {
       instr = DefineAsRegister(new(zone()) LDummy());
     } else {
+      ASSERT(!current->OperandAt(0)->IsControlInstruction());
       instr = DefineAsRegister(new(zone())
           LDummyUse(UseAny(current->OperandAt(0))));
     }
     for (int i = 1; i < current->OperandCount(); ++i) {
+      if (current->OperandAt(i)->IsControlInstruction()) continue;
       LInstruction* dummy =
           new(zone()) LDummyUse(UseAny(current->OperandAt(i)));
       dummy->set_hydrogen_value(current);

src/x64/lithium-x64.cc

@@ -857,10 +857,12 @@ void LChunkBuilder::VisitInstruction(HInstruction* current) {
     if (current->OperandCount() == 0) {
       instr = DefineAsRegister(new(zone()) LDummy());
     } else {
+      ASSERT(!current->OperandAt(0)->IsControlInstruction());
       instr = DefineAsRegister(new(zone())
           LDummyUse(UseAny(current->OperandAt(0))));
     }
     for (int i = 1; i < current->OperandCount(); ++i) {
+      if (current->OperandAt(i)->IsControlInstruction()) continue;
       LInstruction* dummy =
           new(zone()) LDummyUse(UseAny(current->OperandAt(i)));
       dummy->set_hydrogen_value(current);