[arm] Clean up use of IsSupported and IsEnabled.

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

Index: src/compiler/arm/instruction-selector-arm.cc
diff --git a/src/compiler/arm/instruction-selector-arm.cc b/src/compiler/arm/instruction-selector-arm.cc
index 3975e1c1a0f268810bdc5dd0d41af8e686712e82..ceb5b2507f809d912dd4268a3937462274428786 100644
--- a/src/compiler/arm/instruction-selector-arm.cc
+++ b/src/compiler/arm/instruction-selector-arm.cc
@@ -1513,46 +1513,55 @@ void InstructionSelector::VisitFloat64Sqrt(Node* node) {
 
 
 void InstructionSelector::VisitFloat32RoundDown(Node* node) {
+  DCHECK(CpuFeatures::IsSupported(ARMv8));
   VisitRR(this, kArmVrintmF32, node);
 }
 
 
 void InstructionSelector::VisitFloat64RoundDown(Node* node) {
+  DCHECK(CpuFeatures::IsSupported(ARMv8));
   VisitRR(this, kArmVrintmF64, node);
 }
 
 
 void InstructionSelector::VisitFloat32RoundUp(Node* node) {
+  DCHECK(CpuFeatures::IsSupported(ARMv8));
   VisitRR(this, kArmVrintpF32, node);
 }
 
 
 void InstructionSelector::VisitFloat64RoundUp(Node* node) {
+  DCHECK(CpuFeatures::IsSupported(ARMv8));
   VisitRR(this, kArmVrintpF64, node);
 }
 
 
 void InstructionSelector::VisitFloat32RoundTruncate(Node* node) {
+  DCHECK(CpuFeatures::IsSupported(ARMv8));
   VisitRR(this, kArmVrintzF32, node);
 }
 
 
 void InstructionSelector::VisitFloat64RoundTruncate(Node* node) {
+  DCHECK(CpuFeatures::IsSupported(ARMv8));
   VisitRR(this, kArmVrintzF64, node);
 }
 
 
 void InstructionSelector::VisitFloat64RoundTiesAway(Node* node) {
+  DCHECK(CpuFeatures::IsSupported(ARMv8));
   VisitRR(this, kArmVrintaF64, node);
 }
 
 
 void InstructionSelector::VisitFloat32RoundTiesEven(Node* node) {
+  DCHECK(CpuFeatures::IsSupported(ARMv8));
   VisitRR(this, kArmVrintnF32, node);
 }
 
 
 void InstructionSelector::VisitFloat64RoundTiesEven(Node* node) {
+  DCHECK(CpuFeatures::IsSupported(ARMv8));
   VisitRR(this, kArmVrintnF64, node);
 }