Extend JSBuiltinReducer to cover Math.sqrt as well.

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 a37ebf21df963b2852cfe98599dddc5950f74834..ae93b27f453f0767343202b036a4c2dd87f182e4 100644
--- a/src/compiler/arm/instruction-selector-arm.cc
+++ b/src/compiler/arm/instruction-selector-arm.cc
@@ -90,6 +90,7 @@ class ArmOperandGenerator FINAL : public OperandGenerator {
       case kArmVdivF64:
       case kArmVmodF64:
       case kArmVnegF64:
+      case kArmVsqrtF64:
       case kArmVcvtF64S32:
       case kArmVcvtF64U32:
       case kArmVcvtS32F64:
@@ -768,6 +769,12 @@ void InstructionSelector::VisitFloat64Mod(Node* node) {
 }
 
 
+void InstructionSelector::VisitFloat64Sqrt(Node* node) {
+  ArmOperandGenerator g(this);
+  Emit(kArmVsqrtF64, g.DefineAsRegister(node), g.UseRegister(node->InputAt(0)));
+}
+
+
 void InstructionSelector::VisitCall(Node* call, BasicBlock* continuation,
                                     BasicBlock* deoptimization) {
   ArmOperandGenerator g(this);