Constant fold math and string operations.

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index d804979d2e3927e1affde0146643f534e96fdf07..9b12e7a4a7fa4226a8112c278e72a092bc960e9f 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -7263,19 +7263,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_Math_pow) {
   }
 
   CONVERT_DOUBLE_ARG_CHECKED(y, 1);
-  int y_int = static_cast<int>(y);
-  double result;
-  if (y == y_int) {
-    result = power_double_int(x, y_int);  // Returns 1 if exponent is 0.
-  } else  if (y == 0.5) {
-    result = (isinf(x)) ? V8_INFINITY
-                        : fast_sqrt(x + 0.0);  // Convert -0 to +0.
-  } else if (y == -0.5) {
-    result = (isinf(x)) ? 0
-                        : 1.0 / fast_sqrt(x + 0.0);  // Convert -0 to +0.
-  } else {
-    result = power_double_double(x, y);
-  }
+  double result = power_helper(x, y);
   if (isnan(result)) return isolate->heap()->nan_value();
   return isolate->heap()->AllocateHeapNumber(result);
 }