Added sqrt and pow for arm and x64 - to fix build failures.

src/x64/codegen-x64.cc

Index: src/x64/codegen-x64.cc
===================================================================
--- src/x64/codegen-x64.cc	(revision 4053)
+++ src/x64/codegen-x64.cc	(working copy)
@@ -3933,7 +3933,7 @@
 
 
 // Generates the Math.pow method - currently just calls runtime.
-void CodeGenerator::GeneratePow(ZoneList<Expression*>* args) {
+void CodeGenerator::GenerateMathPow(ZoneList<Expression*>* args) {
   ASSERT(args->length() == 2);
   Load(args->at(0));
   Load(args->at(1));
@@ -3942,6 +3942,15 @@
 }
 
 
+// Generates the Math.sqrt method - currently just calls runtime.
+void CodeGenerator::GenerateMathSqrt(ZoneList<Expression*>* args) {
+  ASSERT(args->length() == 1);
+  Load(args->at(0));
+  Result res = frame_->CallRuntime(Runtime::kMath_sqrt, 1);
+  frame_->Push(&res);
+}
+
+
 void CodeGenerator::GenerateIsSmi(ZoneList<Expression*>* args) {
   ASSERT(args->length() == 1);
   Load(args->at(0));