Lazily initialize fast_sqrt() and pass an Isolate parameter to it

src/assembler.cc

Index: src/assembler.cc
diff --git a/src/assembler.cc b/src/assembler.cc
index a9e56576767fdb6d72a70fcffe77626903b32e29..45db5bc4fe76ba3e5ca616545fcc33ac0eea5217 100644
--- a/src/assembler.cc
+++ b/src/assembler.cc
@@ -1469,17 +1469,20 @@ ExternalReference ExternalReference::runtime_function_table_address(
 }
 
 
-double power_helper(double x, double y) {
+double power_helper(Isolate* isolate, double x, double y) {
   int y_int = static_cast<int>(y);
   if (y == y_int) {
     return power_double_int(x, y_int);  // Returns 1 if exponent is 0.
   }
   if (y == 0.5) {
+    lazily_initialize_fast_sqrt(isolate);
     return (std::isinf(x)) ? V8_INFINITY
-                           : fast_sqrt(x + 0.0);  // Convert -0 to +0.
+                           : fast_sqrt(x + 0.0, isolate);  // Convert -0 to +0.
   }
   if (y == -0.5) {
-    return (std::isinf(x)) ? 0 : 1.0 / fast_sqrt(x + 0.0);  // Convert -0 to +0.
+    lazily_initialize_fast_sqrt(isolate);
+    return (std::isinf(x)) ? 0 : 1.0 / fast_sqrt(x + 0.0,
+                                                 isolate);  // Convert -0 to +0.
   }
   return power_double_double(x, y);
 }